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<channel>
    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[GODRIVER-1138] size of collection is 3.6MB, load from mongo with v1.0.3, profile it use 26MB</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-1138</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;size of collection is 3.6MB&lt;/p&gt;

&lt;p&gt;{&lt;br/&gt;
 &quot;ns&quot; : &quot;test.globalAirport&quot;,&lt;br/&gt;
 &quot;size&quot; : 3735316,&lt;br/&gt;
 &quot;count&quot; : 5320,&lt;br/&gt;
 &quot;avgObjSize&quot; : 702,&lt;br/&gt;
 &quot;storageSize&quot; : 1646592,&lt;br/&gt;
 &quot;capped&quot; : false,&lt;br/&gt;
 &quot;wiredTiger&quot; : {&lt;br/&gt;
 &quot;metadata&quot; : &lt;/p&gt;
{
 &quot;formatVersion&quot; : 1
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;creationString&quot; : &quot;access_pattern_hint=none,allocation_size=4KB,app_metadata=(formatVersion=1),assert=(commit_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=snappy,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=64MB,log=(enabled=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_image_max=0,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,prefix_compression_min=4,source=,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,type=file,value_format=u&quot;,&lt;br/&gt;
 &quot;type&quot; : &quot;file&quot;,&lt;br/&gt;
 &quot;uri&quot; : &quot;statistics:table:collection-0-3820145496175747809&quot;,&lt;br/&gt;
 &quot;LSM&quot; : &lt;/p&gt;
{
 &quot;bloom filter false positives&quot; : 0,
 &quot;bloom filter hits&quot; : 0,
 &quot;bloom filter misses&quot; : 0,
 &quot;bloom filter pages evicted from cache&quot; : 0,
 &quot;bloom filter pages read into cache&quot; : 0,
 &quot;bloom filters in the LSM tree&quot; : 0,
 &quot;chunks in the LSM tree&quot; : 0,
 &quot;highest merge generation in the LSM tree&quot; : 0,
 &quot;queries that could have benefited from a Bloom filter that did not exist&quot; : 0,
 &quot;sleep for LSM checkpoint throttle&quot; : 0,
 &quot;sleep for LSM merge throttle&quot; : 0,
 &quot;total size of bloom filters&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;block-manager&quot; : &lt;/p&gt;
{
 &quot;allocations requiring file extension&quot; : 0,
 &quot;blocks allocated&quot; : 0,
 &quot;blocks freed&quot; : 0,
 &quot;checkpoint size&quot; : 1626112,
 &quot;file allocation unit size&quot; : 4096,
 &quot;file bytes available for reuse&quot; : 4096,
 &quot;file magic number&quot; : 120897,
 &quot;file major version number&quot; : 1,
 &quot;file size in bytes&quot; : 1646592,
 &quot;minor version number&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;btree&quot; : &lt;/p&gt;
{
 &quot;btree checkpoint generation&quot; : 327,
 &quot;column-store fixed-size leaf pages&quot; : 0,
 &quot;column-store internal pages&quot; : 0,
 &quot;column-store variable-size RLE encoded values&quot; : 0,
 &quot;column-store variable-size deleted values&quot; : 0,
 &quot;column-store variable-size leaf pages&quot; : 0,
 &quot;fixed-record size&quot; : 0,
 &quot;maximum internal page key size&quot; : 368,
 &quot;maximum internal page size&quot; : 4096,
 &quot;maximum leaf page key size&quot; : 2867,
 &quot;maximum leaf page size&quot; : 32768,
 &quot;maximum leaf page value size&quot; : 67108864,
 &quot;maximum tree depth&quot; : 3,
 &quot;number of key/value pairs&quot; : 0,
 &quot;overflow pages&quot; : 0,
 &quot;pages rewritten by compaction&quot; : 0,
 &quot;row-store internal pages&quot; : 0,
 &quot;row-store leaf pages&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;cache&quot; : &lt;/p&gt;
{
 &quot;bytes currently in the cache&quot; : 4143142,
 &quot;bytes read into cache&quot; : 3774291,
 &quot;bytes written from cache&quot; : 0,
 &quot;checkpoint blocked page eviction&quot; : 0,
 &quot;data source pages selected for eviction unable to be evicted&quot; : 0,
 &quot;eviction walk passes of a file&quot; : 0,
 &quot;eviction walk target pages histogram - 0-9&quot; : 0,
 &quot;eviction walk target pages histogram - 10-31&quot; : 0,
 &quot;eviction walk target pages histogram - 128 and higher&quot; : 0,
 &quot;eviction walk target pages histogram - 32-63&quot; : 0,
 &quot;eviction walk target pages histogram - 64-128&quot; : 0,
 &quot;eviction walks abandoned&quot; : 0,
 &quot;eviction walks gave up because they restarted their walk twice&quot; : 0,
 &quot;eviction walks gave up because they saw too many pages and found no candidates&quot; : 0,
 &quot;eviction walks gave up because they saw too many pages and found too few candidates&quot; : 0,
 &quot;eviction walks reached end of tree&quot; : 0,
 &quot;eviction walks started from root of tree&quot; : 0,
 &quot;eviction walks started from saved location in tree&quot; : 0,
 &quot;hazard pointer blocked page eviction&quot; : 0,
 &quot;in-memory page passed criteria to be split&quot; : 0,
 &quot;in-memory page splits&quot; : 0,
 &quot;internal pages evicted&quot; : 0,
 &quot;internal pages split during eviction&quot; : 0,
 &quot;leaf pages split during eviction&quot; : 0,
 &quot;modified pages evicted&quot; : 0,
 &quot;overflow pages read into cache&quot; : 0,
 &quot;page split during eviction deepened the tree&quot; : 0,
 &quot;page written requiring lookaside records&quot; : 0,
 &quot;pages read into cache&quot; : 135,
 &quot;pages read into cache after truncate&quot; : 0,
 &quot;pages read into cache after truncate in prepare state&quot; : 0,
 &quot;pages read into cache requiring lookaside entries&quot; : 0,
 &quot;pages requested from the cache&quot; : 2807,
 &quot;pages seen by eviction walk&quot; : 0,
 &quot;pages written from cache&quot; : 0,
 &quot;pages written requiring in-memory restoration&quot; : 0,
 &quot;tracked dirty bytes in the cache&quot; : 0,
 &quot;unmodified pages evicted&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;cache_walk&quot; : &lt;/p&gt;
{
 &quot;Average difference between current eviction generation when the page was last considered&quot; : 0,
 &quot;Average on-disk page image size seen&quot; : 0,
 &quot;Average time in cache for pages that have been visited by the eviction server&quot; : 0,
 &quot;Average time in cache for pages that have not been visited by the eviction server&quot; : 0,
 &quot;Clean pages currently in cache&quot; : 0,
 &quot;Current eviction generation&quot; : 0,
 &quot;Dirty pages currently in cache&quot; : 0,
 &quot;Entries in the root page&quot; : 0,
 &quot;Internal pages currently in cache&quot; : 0,
 &quot;Leaf pages currently in cache&quot; : 0,
 &quot;Maximum difference between current eviction generation when the page was last considered&quot; : 0,
 &quot;Maximum page size seen&quot; : 0,
 &quot;Minimum on-disk page image size seen&quot; : 0,
 &quot;Number of pages never visited by eviction server&quot; : 0,
 &quot;On-disk page image sizes smaller than a single allocation unit&quot; : 0,
 &quot;Pages created in memory and never written&quot; : 0,
 &quot;Pages currently queued for eviction&quot; : 0,
 &quot;Pages that could not be queued for eviction&quot; : 0,
 &quot;Refs skipped during cache traversal&quot; : 0,
 &quot;Size of the root page&quot; : 0,
 &quot;Total number of pages currently in cache&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;compression&quot; : &lt;/p&gt;
{
 &quot;compressed pages read&quot; : 134,
 &quot;compressed pages written&quot; : 0,
 &quot;page written failed to compress&quot; : 0,
 &quot;page written was too small to compress&quot; : 0,
 &quot;raw compression call failed, additional data available&quot; : 0,
 &quot;raw compression call failed, no additional data available&quot; : 0,
 &quot;raw compression call succeeded&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;cursor&quot; : &lt;/p&gt;
{
 &quot;bulk-loaded cursor-insert calls&quot; : 0,
 &quot;create calls&quot; : 2,
 &quot;cursor operation restarted&quot; : 0,
 &quot;cursor-insert key and value bytes inserted&quot; : 0,
 &quot;cursor-remove key bytes removed&quot; : 0,
 &quot;cursor-update value bytes updated&quot; : 0,
 &quot;cursors cached on close&quot; : 0,
 &quot;cursors reused from cache&quot; : 33,
 &quot;insert calls&quot; : 0,
 &quot;modify calls&quot; : 0,
 &quot;next calls&quot; : 85338,
 &quot;prev calls&quot; : 1,
 &quot;remove calls&quot; : 0,
 &quot;reserve calls&quot; : 0,
 &quot;reset calls&quot; : 728,
 &quot;search calls&quot; : 0,
 &quot;search near calls&quot; : 656,
 &quot;truncate calls&quot; : 0,
 &quot;update calls&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;reconciliation&quot; : &lt;/p&gt;
{
 &quot;dictionary matches&quot; : 0,
 &quot;fast-path pages deleted&quot; : 0,
 &quot;internal page key bytes discarded using suffix compression&quot; : 0,
 &quot;internal page multi-block writes&quot; : 0,
 &quot;internal-page overflow keys&quot; : 0,
 &quot;leaf page key bytes discarded using prefix compression&quot; : 0,
 &quot;leaf page multi-block writes&quot; : 0,
 &quot;leaf-page overflow keys&quot; : 0,
 &quot;maximum blocks required for a page&quot; : 0,
 &quot;overflow values written&quot; : 0,
 &quot;page checksum matches&quot; : 0,
 &quot;page reconciliation calls&quot; : 0,
 &quot;page reconciliation calls for eviction&quot; : 0,
 &quot;pages deleted&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;session&quot; : &lt;/p&gt;
{
 &quot;cached cursor count&quot; : 2,
 &quot;object compaction&quot; : 0,
 &quot;open cursor count&quot; : 0
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;transaction&quot; : &lt;/p&gt;
{
 &quot;update conflicts&quot; : 0
 }
&lt;p&gt; },&lt;br/&gt;
 &quot;nindexes&quot; : 1,&lt;br/&gt;
 &quot;totalIndexSize&quot; : 86016,&lt;br/&gt;
 &quot;indexSizes&quot; : &lt;/p&gt;
{
 &quot;_id_&quot; : 86016
 }
&lt;p&gt;,&lt;br/&gt;
 &quot;ok&quot; : 1.0&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;mycode&lt;/p&gt;

&lt;p&gt;..............&lt;/p&gt;

&lt;p&gt;collection := client.Database(mgoc.Database).Collection(GetGlobalAirportCollection().Collection) collection := client.Database(mgoc.Database).Collection(GetGlobalAirportCollection().Collection) ctx, cancle := context.WithTimeout(context.Background(), 30*time.Second) defer cancle() cur, err := collection.Find(ctx, bson.D{}) if err != nil { return } defer cur.Close(ctx) for cur.Next(ctx) { var result GlobAirport err := cur.Decode(&amp;amp;result) if err != nil &lt;/p&gt;
{ continue }
&lt;p&gt; // do something with result.... sli = append(sli, result) } if err = cur.Err(); err != nil { return }&lt;/p&gt;

&lt;p&gt;..............&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;go profile&lt;/p&gt;

&lt;p&gt;macbookpro:Downloads fredlee$ go tool pprof &lt;a href=&quot;http://ip:port/debug/pprof/heap&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://ip:port/debug/pprof/heap&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Fetching profile over HTTP from &lt;a href=&quot;http://ip:port/debug/pprof/heap&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://ip:port/debug/pprof/heap&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Saved profile in /Users/fredlee/pprof/pprof.catweb_server.alloc_objects.alloc_space.inuse_objects.inuse_space.009.pb.gz&lt;/p&gt;

&lt;p&gt;File: catweb_server&lt;/p&gt;

&lt;p&gt;Type: inuse_space&lt;/p&gt;

&lt;p&gt;Time: Jun 14, 2019 at 8:55pm (CST)&lt;/p&gt;

&lt;p&gt;Entering interactive mode (type &quot;help&quot; for commands, &quot;o&quot; for options)&lt;/p&gt;

&lt;p&gt;(pprof) top10 -cum&lt;/p&gt;

&lt;p&gt;Showing nodes accounting for 0, 0% of 24.44MB total&lt;/p&gt;

&lt;p&gt;Showing top 10 nodes out of 40&lt;/p&gt;

&lt;p&gt;&#160; &#160; &#160; flat&#160; flat% &#160; sum%&#160; &#160; &#160; &#160; cum &#160; cum%&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; catweb_server/internal/async.(*M1).Start&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; catweb_server/internal/async.(*M1).handle&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; catweb_server/internal/db.(*MongoOfficalClient).Do&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; catweb_server/util.(*GlobAirports).LoadFromDb&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; catweb_server/util.(*GlobAirports).LoadFromDb.func1&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; go.mongodb.org/mongo-driver/mongo.(*Cursor).Next&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; go.mongodb.org/mongo-driver/x/mongo/driver.(*BatchCursor).Next&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; go.mongodb.org/mongo-driver/x/mongo/driver.(*BatchCursor).getMore&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; go.mongodb.org/mongo-driver/x/network/command.(*GetMore).RoundTrip&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0%&#160; &#160; 24.44MB &#160; 100%&#160; go.mongodb.org/mongo-driver/x/network/command.(*Read).RoundTrip&lt;/p&gt;

&lt;p&gt;(pprof) list LoadFromDb&lt;/p&gt;

&lt;p&gt;Total: 24.44MB&lt;/p&gt;

&lt;p&gt;ROUTINE ======================== catweb_server/util.(*GlobAirports).LoadFromDb in /Users/fredlee/Documents/project/&#21830;&#22478;/catweb_server/util/mongo_globalairport.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 24.44MB (flat, cum) &#160; 100% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 71: if err = cur.Err(); err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 72: return

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 73: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 74: return&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 75: }&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 24.44MB &#160; &#160; 76: err = mgoc.Do(handler)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 77: if err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 78: return

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 79: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 80:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 81: num = len(sli)&lt;/p&gt;

&lt;p&gt;ROUTINE ======================== catweb_server/util.(*GlobAirports).LoadFromDb.func1 in /Users/fredlee/Documents/project/&#21830;&#22478;/catweb_server/util/mongo_globalairport.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 24.44MB (flat, cum) &#160; 100% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 57: cur, err := collection.Find(ctx, bson.D{})&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 58: if err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 59: return

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 60: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 61: defer cur.Close(ctx)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 24.44MB &#160; &#160; 62: for cur.Next(ctx) {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 63: var result GlobAirport&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 64: err := cur.Decode(&amp;amp;result)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 65: if err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 66: continue

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 67: }

&lt;p&gt;(pprof) list Next&lt;/p&gt;

&lt;p&gt;Total: 24.44MB&lt;/p&gt;

&lt;p&gt;ROUTINE ======================== go.mongodb.org/mongo-driver/mongo.(*Cursor).Next in /Users/fredlee/Documents/develop/go/workspace/pkg/mod/go.mongodb.org/mongo-driver@v1.0.3/mongo/cursor.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 24.44MB (flat, cum) &#160; 100% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 88:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 89: // call the Next method in a loop until at least one document is returned in the next batch or&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 90: // the context times out.&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 91: for {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 92: // If we don&apos;t have a next batch&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 24.44MB &#160; &#160; 93: if !c.bc.Next(ctx) {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 94: // Do we have an error? If so we return false.&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 95: c.err = c.bc.Err()&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 96: if c.err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 97: return false

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 98: }

&lt;p&gt;ROUTINE ======================== go.mongodb.org/mongo-driver/x/mongo/driver.(*BatchCursor).Next in /Users/fredlee/Documents/develop/go/workspace/pkg/mod/go.mongodb.org/mongo-driver@v1.0.3/x/mongo/driver/batch_cursor.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 24.44MB (flat, cum) &#160; 100% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 155: }&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 156:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 157: if bc.legacy() &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 158: bc.legacyGetMore(ctx)

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 159: }
&lt;p&gt; else &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 24.44MB&#160; &#160; 160: bc.getMore(ctx)

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 161: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 162:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 163: switch bc.currentBatch.Style &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 164: case bsoncore.SequenceStyle:

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 165: return len(bc.currentBatch.Data) &amp;gt; 0

(pprof) list getMore

Total: 24.44MB

ROUTINE ======================== go.mongodb.org/mongo-driver/x/mongo/driver.(*BatchCursor).getMore in /Users/fredlee/Documents/develop/go/workspace/pkg/mod/go.mongodb.org/mongo-driver@v1.0.3/x/mongo/driver/batch_cursor.go

&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 24.44MB (flat, cum) &#160; 100% of Total

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 244: Clock: &#160; bc.clock,

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 245: ID:&#160; &#160; &#160; bc.id,

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 246: NS:&#160; &#160; &#160; bc.namespace,

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 247: Opts:&#160; &#160; bc.opts,

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 248: Session: bc.clientSession,

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 24.44MB&#160; &#160; 249: }
&lt;p&gt;).RoundTrip(ctx, bc.server.SelectedDescription(), conn)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 250: if err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 251: _ = conn.Close() // The command response error is more important here

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 252: bc.err = err

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 253: return

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 254: }

&lt;p&gt;(pprof) list RoundTrip&lt;/p&gt;

&lt;p&gt;Total: 24.44MB&lt;/p&gt;

&lt;p&gt;ROUTINE ======================== go.mongodb.org/mongo-driver/x/network/command.(*GetMore).RoundTrip in /Users/fredlee/Documents/develop/go/workspace/pkg/mod/go.mongodb.org/mongo-driver@v1.0.3/x/network/command/get_more.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 24.44MB (flat, cum) &#160; 100% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 97: cmd, err := gm.encode(desc)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 98: if err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; . &#160; &#160; 99: return nil, err

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 100: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 101:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 24.44MB&#160; &#160; 102: rdr, err := cmd.RoundTrip(ctx, desc, rw)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 103: if err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 104: return nil, err

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 105: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 106:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 107: return gm.decode(desc, rdr).Result()&lt;/p&gt;

&lt;p&gt;ROUTINE ======================== go.mongodb.org/mongo-driver/x/network/command.(*Read).RoundTrip in /Users/fredlee/Documents/develop/go/workspace/pkg/mod/go.mongodb.org/mongo-driver@v1.0.3/x/network/command/read.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 24.44MB (flat, cum) &#160; 100% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 266: return nil, err&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 267: }&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 268: // Connection errors are transient&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 269: return nil, Error{Message: err.Error(), Labels: []string{TransientTransactionError, NetworkError}}&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 270: }&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; . &#160; &#160; 3.53MB&#160; &#160; 271: wm, err = rw.ReadWireMessage(ctx)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 272: if err != nil {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 273: if _, ok := err.(Error); ok &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 274: return nil, err

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 275: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 276: // Connection errors are transient&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 277: return nil, Error{Message: err.Error(), Labels: []string{TransientTransactionError, NetworkError}}&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 278: }&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 279:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 280: if r.Session != nil {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 281: err = r.Session.UpdateUseTime()&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 282: if err != nil &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 283: return nil, err

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 284: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 285: }&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 20.92MB&#160; &#160; 286: return r.Decode(desc, wm).Result()&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 287:}&lt;/p&gt;

&lt;p&gt;(pprof) list Decode&lt;/p&gt;

&lt;p&gt;Total: 24.44MB&lt;/p&gt;

&lt;p&gt;ROUTINE ======================== go.mongodb.org/mongo-driver/x/network/command.(*Read).Decode in /Users/fredlee/Documents/develop/go/workspace/pkg/mod/go.mongodb.org/mongo-driver@v1.0.3/x/network/command/read.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 20.92MB (flat, cum) 85.57% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 221:func (r *Read) Decode(desc description.SelectedServer, wm wiremessage.WireMessage) *Read {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 222: switch wm.(type) &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 223: case wiremessage.Reply:

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 224: r.decodeOpReply(wm)

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 225: default:

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 20.92MB&#160; &#160; 226: r.decodeOpMsg(wm)

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 227: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 228:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 229: if r.err != nil {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 230: // decode functions set error if an invalid response document was returned or if the OK flag in the response was 0&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 231: // if the OK flag was 0, a type Error is returned. otherwise, a special type is returned&lt;/p&gt;

&lt;p&gt;(pprof) cd decodeOpMsg&lt;/p&gt;

&lt;p&gt;Unrecognized command: &quot;cd&quot;&lt;/p&gt;

&lt;p&gt;(pprof) list decodeOpMsg&lt;/p&gt;

&lt;p&gt;Total: 24.44MB&lt;/p&gt;

&lt;p&gt;ROUTINE ======================== go.mongodb.org/mongo-driver/x/network/command.(*Read).decodeOpMsg in /Users/fredlee/Documents/develop/go/workspace/pkg/mod/go.mongodb.org/mongo-driver@v1.0.3/x/network/command/read.go&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0&#160; &#160; 20.92MB (flat, cum) 85.57% of Total&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 180: if !ok &lt;/p&gt;
{

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 181: r.err = fmt.Errorf(&quot;unsupported response wiremessage type %T&quot;, wm)

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 182: return

&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 183: }

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 184:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; 20.92MB&#160; &#160; 185: r.result, r.err = decodeCommandOpMsg(msg)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 186:}&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 187:&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 188:func (r *Read) decodeOpReply(wm wiremessage.WireMessage) {&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 189: reply, ok := wm.(wiremessage.Reply)&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; .&#160; &#160; &#160; &#160; &#160; .&#160; &#160; 190: if !ok {&lt;/p&gt;

&lt;p&gt;(pprof) peek decodeCommandOpMsg&lt;/p&gt;

&lt;p&gt;Showing nodes accounting for 25030.85kB, 100% of 25030.85kB total&lt;/p&gt;

&lt;p&gt;---------------------------------------------------------&lt;del&gt;+&lt;/del&gt;------------&lt;/p&gt;

&lt;p&gt;&#160; &#160; &#160; flat&#160; flat% &#160; sum%&#160; &#160; &#160; &#160; cum &#160; cum% &#160; calls calls% + context&#160; &#160;&lt;/p&gt;

&lt;p&gt;---------------------------------------------------------&lt;del&gt;+&lt;/del&gt;------------&lt;/p&gt;

&lt;p&gt;&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; 21419.71kB &#160; 100% | &#160; go.mongodb.org/mongo-driver/x/network/command.(*Read).decodeOpMsg&lt;/p&gt;

&lt;p&gt;&#160;&#160; &#160; &#160; &#160; 0 &#160; &#160; 0% &#160; &#160; 0% 21419.71kB 85.57%&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; | go.mongodb.org/mongo-driver/x/network/command.decodeCommandOpMsg&lt;/p&gt;

&lt;p&gt;&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; 13847.71kB 64.65% | &#160; go.mongodb.org/mongo-driver/x/bsonx.(*Doc).UnmarshalBSON&lt;/p&gt;

&lt;p&gt;&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; 7572kB 35.35% | &#160; go.mongodb.org/mongo-driver/x/bsonx.Doc.MarshalBSON&lt;/p&gt;

&lt;p&gt;---------------------------------------------------------&lt;del&gt;+&lt;/del&gt;------------&lt;/p&gt;

&lt;p&gt;(pprof) &lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment>go version go1.12.5&lt;br/&gt;
Linux VM-0-4-ubuntu 4.4.0-130-generic #156-Ubuntu SMP Thu Jun 14 08:53:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux</environment>
        <key id="802715">GODRIVER-1138</key>
            <summary>size of collection is 3.6MB, load from mongo with v1.0.3, profile it use 26MB</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13203">Gone away</resolution>
                                        <assignee username="kris.brandow@mongodb.com">Kristofer Brandow</assignee>
                                    <reporter username="jackylee">orange.jackylee</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Jun 2019 13:09:34 +0000</created>
                <updated>Fri, 27 Oct 2023 20:01:24 +0000</updated>
                            <resolved>Thu, 11 Jul 2019 20:05:27 +0000</resolved>
                                    <version>1.0.3</version>
                                                    <component>CRUD</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2291980" author="esha.bhargava" created="Thu, 20 Jun 2019 20:08:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jackylee&quot; class=&quot;user-hover&quot; rel=&quot;jackylee&quot;&gt;jackylee&lt;/a&gt; Can you please try to reproduce this on the master branch? This code path has changed significantly and will no longer be used.&lt;/p&gt;</comment>
                            <comment id="2287991" author="jackylee" created="Tue, 18 Jun 2019 03:27:07 +0000"  >&lt;p&gt;why not reply my issue&lt;/p&gt;</comment>
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