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  1. Core Server
  2. SERVER-17622

Total storage size for Journal substantially different for WT and MMAPv1

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 3.0.0
    • Component/s: MMAPv1, Storage, WiredTiger
    • Fully Compatible
    • ALL
    • Hide

      /home/alvin/mongodb-linux-x86_64-3.0.1/bin/mongod --dbpath /data-nfs/db --logpath /data3/logs/db/sysbench/server.log --fork --syncdelay 14400 --storageEngine=mmapv1 --bind_ip 127.0.0.1

      sh /home/alvin/alvin-sysbench-new/run.simple.bash 16

      Show
      /home/alvin/mongodb-linux-x86_64-3.0.1/bin/mongod --dbpath /data-nfs/db --logpath /data3/logs/db/sysbench/server.log --fork --syncdelay 14400 --storageEngine=mmapv1 --bind_ip 127.0.0.1 sh /home/alvin/alvin-sysbench-new/run.simple.bash 16

      Problem

      Using sysbench to load 16M documents (in 16 collections) and then execute a 10 minute workload results in very different storage usage. WiredTiger uses 5GB, MMAPv1 20GB. The substantial difference is in the journal directory 1.8 GB(WT) versus 16GB (MMAPv1).

      wiredTiger

       
alvin@bismark:/data-nfs/db$ du -sh
5.0G	.

16K	collection-0--6859785001528658125.wt
186M	collection-11--6859785001528658125.wt
186M	collection-14--6859785001528658125.wt
186M	collection-17--6859785001528658125.wt
186M	collection-20--6859785001528658125.wt
186M	collection-23--6859785001528658125.wt
186M	collection-26--6859785001528658125.wt
186M	collection-2--6859785001528658125.wt
186M	collection-29--6859785001528658125.wt
186M	collection-32--6859785001528658125.wt
186M	collection-35--6859785001528658125.wt
186M	collection-38--6859785001528658125.wt
186M	collection-41--6859785001528658125.wt
186M	collection-44--6859785001528658125.wt
186M	collection-47--6859785001528658125.wt
186M	collection-5--6859785001528658125.wt
186M	collection-8--6859785001528658125.wt
9.0M	index-10--6859785001528658125.wt
9.8M	index-12--6859785001528658125.wt
8.9M	index-13--6859785001528658125.wt
9.8M	index-15--6859785001528658125.wt
8.8M	index-16--6859785001528658125.wt
16K	index-1--6859785001528658125.wt
9.8M	index-18--6859785001528658125.wt
9.0M	index-19--6859785001528658125.wt
9.8M	index-21--6859785001528658125.wt
9.0M	index-22--6859785001528658125.wt
9.8M	index-24--6859785001528658125.wt
9.0M	index-25--6859785001528658125.wt
9.8M	index-27--6859785001528658125.wt
9.1M	index-28--6859785001528658125.wt
9.8M	index-30--6859785001528658125.wt
9.1M	index-31--6859785001528658125.wt
9.8M	index-33--6859785001528658125.wt
9.1M	index-34--6859785001528658125.wt
9.8M	index-36--6859785001528658125.wt
9.8M	index-3--6859785001528658125.wt
9.1M	index-37--6859785001528658125.wt
9.8M	index-39--6859785001528658125.wt
9.0M	index-40--6859785001528658125.wt
9.8M	index-42--6859785001528658125.wt
9.1M	index-43--6859785001528658125.wt
9.8M	index-45--6859785001528658125.wt
9.1M	index-46--6859785001528658125.wt
8.9M	index-4--6859785001528658125.wt
9.8M	index-48--6859785001528658125.wt
9.1M	index-49--6859785001528658125.wt
9.8M	index-6--6859785001528658125.wt
9.0M	index-7--6859785001528658125.wt
9.8M	index-9--6859785001528658125.wt
1.8G	journal
16K	_mdb_catalog.wt
0	mongod.lock
32K	sizeStorer.wt
4.0K	storage.bson
12K	_tmp
0	WiredTiger
4.0K	WiredTiger.basecfg
0	WiredTiger.lock
4.0K	WiredTiger.turtle
164K	WiredTiger.wt

      MMAPv1

      == MMAP
alvin@bismark:/data-nfs/db$ du -sh
20G     .

alvin@bismark:/data-nfs/db$ du -sh *
16G     journal
52K     local.0
17M     local.ns
0       mongod.lock
63M     sbtest.0
121M    sbtest.1
254M    sbtest.2
502M    sbtest.3
1003M   sbtest.4
2.0G    sbtest.5
898M    sbtest.6
37M     sbtest.7
17M     sbtest.ns
4.0K    storage.bson
4.0K    _tmp

            Assignee:
            Unassigned Unassigned
            Reporter:
            alvin Alvin Richards (Inactive)
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            Watchers:
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              Created:
              Updated:
              Resolved: