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    <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>[SERVER-5045] Illegal math operations computing in JS V8 </title>
                <link>https://jira.mongodb.org/browse/SERVER-5045</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For Intensives findAndModify operations which use a service call $inc in some cases there is a loss 0.00000000000000005, 0.00000000000000001, 0.66666666666666667 and 0.33333333333333333. This effect is mistery! No memory leak detected, memory  and CPU working correctly. Test also working on other OS.&lt;/p&gt;

&lt;p&gt;example for node.js (db already connected for database)&lt;/p&gt;

&lt;p&gt;begin:&lt;br/&gt;
db.collection(&quot;test&quot;).save(&lt;/p&gt;
{a: 1, test:10000000}
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;test:&lt;br/&gt;
for(var i=0;i&amp;lt;1000000;i++) {&lt;br/&gt;
  db.collection(&quot;test&quot;).findAndModify(&lt;/p&gt;
{a:1}
&lt;p&gt;,[], {$inc: {test: -0.01}},&lt;/p&gt;
{new:true}
&lt;p&gt;,function(err,v)&lt;/p&gt;
{if(v!=null)console.log(v);}
&lt;p&gt;);&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;After approximately 10 to 10000 operations - there is a loss on the error&lt;br/&gt;
This is math error, maybe in V8 engine &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/sad.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; &lt;br/&gt;
P.S. SpiderMonkey engine don&apos;t have this bug - I&apos;m already test it.&lt;/p&gt;</description>
                <environment>FC15 x86-64</environment>
        <key id="31292">SERVER-5045</key>
            <summary>Illegal math operations computing in JS V8 </summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="9">Done</resolution>
                                        <assignee username="antoine">Antoine Girbal</assignee>
                                    <reporter username="qxfusion">Vitaly qxFusion</reporter>
                        <labels>
                            <label>V8</label>
                            <label>javascript</label>
                            <label>logical</label>
                            <label>math</label>
                    </labels>
                <created>Wed, 22 Feb 2012 22:28:08 +0000</created>
                <updated>Wed, 15 Aug 2012 14:24:21 +0000</updated>
                            <resolved>Thu, 15 Mar 2012 01:08:28 +0000</resolved>
                                    <version>2.1.0</version>
                                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="98965" author="antoine" created="Thu, 15 Mar 2012 01:08:28 +0000"  >&lt;p&gt;seems like an earlier math v8 bug was fixed&lt;/p&gt;</comment>
                            <comment id="98961" author="antoine" created="Thu, 15 Mar 2012 01:01:18 +0000"  >&lt;p&gt;Testing above example from Christian, I am seeing same output in v8 and SM when using a recent v8 build.&lt;br/&gt;
Potentially they&apos;ve fix some math since &lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;V8:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; var k = 1000000;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; for(var i = 0; i &amp;lt; 1000; i++) { k = k - 0.01;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;999989.9999999907&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;SM:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; var k = 1000000;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; for(var i = 0; i &amp;lt; 1000; i++) { k = k - 0.01;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;999989.9999999907&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Same thing with 1st example&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;V8:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testjs.drop()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testjs.save({a: 1, test:new NumberLong(10000000)});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; for(var i=0;i&amp;lt;10000;i++) { db.testjs.update({a:1}, {$inc: {test: 0.01}} ); }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testjs.find()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : ObjectId(&quot;4f61368e8116b302fdf4f577&quot;), &quot;a&quot; : 1, &quot;test&quot; : 10000099.999997765 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;SM:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testjs.drop()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testjs.save({a: 1, test:new NumberLong(10000000)});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; for(var i=0;i&amp;lt;10000;i++) { db.testjs.update({a:1}, {$inc: {test: 0.01}} ); }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testjs.find()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : ObjectId(&quot;4f613dc4df3e6fe969a4644c&quot;), &quot;a&quot; : 1, &quot;test&quot; : 10000099.999997765 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;To have perfect accuracy you would need to do math with no floating points.&lt;/p&gt;</comment>
                            <comment id="92324" author="qxfusion" created="Sat, 25 Feb 2012 20:47:27 +0000"  >&lt;p&gt;Unfortunatly node.js driver don&apos;t have this feature. I&apos;m using number only in 0-10000000 dimension whith 2digit accuracy. I&apos;m think this is problem in JS &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/sad.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; (&#1057;++ don&apos;t have this problem)&lt;/p&gt;</comment>
                            <comment id="92321" author="antoine" created="Sat, 25 Feb 2012 20:35:05 +0000"  >&lt;p&gt;it is important to understand that JS uses a double to represent numbers.&lt;br/&gt;
Hence some numbers can end up not exact:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;integers above 2^32 may be inaccurate, and above 2^53 usually wrong&lt;/li&gt;
	&lt;li&gt;floats may not be represented accurately as in your examples.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;As christian outlined, the best approach is to only deal with integers if you want perfect accuracy from JS.&lt;br/&gt;
You can decide that you numbers all have 2 decimals and then always divide by 100 if you want the approx real value.&lt;br/&gt;
Also note that Mongo can store Long values, which are represented as NumberLong() object in the shell (not sure how the nodejs driver handles it).&lt;/p&gt;</comment>
                            <comment id="92231" author="christkv" created="Sat, 25 Feb 2012 07:36:17 +0000"  >&lt;p&gt;I&apos;m not sure how they operate on taking tickets but you can ask here&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://groups.google.com/forum/?fromgroups#!forum/v8-users&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?fromgroups#!forum/v8-users&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;or &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://groups.google.com/forum/?fromgroups#!forum/v8-dev&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?fromgroups#!forum/v8-dev&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I&apos;m not even sure if the behavior is well defined in the js spec so I don&apos;t know if spidermonkey or v8 are doing it right or wrong.&lt;/p&gt;</comment>
                            <comment id="91927" author="qxfusion" created="Fri, 24 Feb 2012 16:52:24 +0000"  >&lt;p&gt;What do you think is possible to make patches for the V8 to optimize the math?&lt;br/&gt;
Unfortunately, your proposal will not be used because code is associated with another node.js application (using float model), and correct it takes a VERY LONG time &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/sad.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;Thanks for the solution &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="91910" author="christkv" created="Fri, 24 Feb 2012 16:29:43 +0000"  >&lt;p&gt;This is a typical issue with doing math on js due to the usage of floats for all the math. I&apos;m not sure there is an easy way around it or why V8 is behaving differently in this case. My choosen way of doing it would be to switch to fixed integer math with longs (new Long()).&lt;/p&gt;

&lt;p&gt;so if you have&lt;/p&gt;

&lt;p&gt;var a = 100&lt;/p&gt;

&lt;p&gt;and the step = 0.01&lt;/p&gt;

&lt;p&gt;then save a as 100 * 100&lt;/p&gt;

&lt;p&gt;and scale the step to 1 and back when needed.&lt;/p&gt;

&lt;p&gt;f.ex&lt;/p&gt;

&lt;p&gt;var k = 1000000;&lt;br/&gt;
for(var i = 0; i &amp;lt; 1000; i++) &lt;/p&gt;
{ k = k - 0.01;}

&lt;p&gt;equals&lt;/p&gt;

&lt;p&gt;999989.9999999907 on spidermonkey&lt;br/&gt;
989999.9999906868 on v8 on the lastest 0.6.X node&lt;/p&gt;</comment>
                            <comment id="91293" author="qxfusion" created="Thu, 23 Feb 2012 10:41:34 +0000"  >&lt;p&gt;Test system is&lt;br/&gt;
HV: Oracle xVM VirtualBox Container x86_64&lt;br/&gt;
CPU: Intel Core i3 &lt;br/&gt;
RAM: Guest - 1.5GB (+1GB SWAP) / Host - 8GB&lt;br/&gt;
Drive: 2x20GB SAS RAID (Virtual LSI Logic)&lt;br/&gt;
OS: Fedora Core 15 (official) + latest kernel (x86_64)&lt;/p&gt;</comment>
                            <comment id="91284" author="qxfusion" created="Thu, 23 Feb 2012 09:50:10 +0000"  >&lt;p&gt;for scotthernandez - it&apos;s bug versions&lt;/p&gt;</comment>
                            <comment id="91179" author="eliot" created="Thu, 23 Feb 2012 01:24:33 +0000"  >&lt;p&gt;Can you send the data or a script that fully reproduces?&lt;/p&gt;</comment>
                            <comment id="91166" author="scotthernandez" created="Thu, 23 Feb 2012 00:28:51 +0000"  >&lt;p&gt;Is there a bug, or did it work?&lt;/p&gt;
</comment>
                            <comment id="91123" author="qxfusion" created="Wed, 22 Feb 2012 22:51:27 +0000"  >&lt;p&gt;This bug work on mongodb 2.0.2-8.fc15(x86_64), mongodb-10gen.x86_64-2.0.2 and also on my custom build&lt;br/&gt;
Node.js version 0.3.2-8.fc15, mongo driver from npm 0.9.9-2 (for x86_64) and also on custom built too.&lt;/p&gt;</comment>
                            <comment id="91115" author="scotthernandez" created="Wed, 22 Feb 2012 22:41:51 +0000"  >&lt;p&gt;Which package(s) didn&apos;t work?&lt;/p&gt;</comment>
                            <comment id="91101" author="qxfusion" created="Wed, 22 Feb 2012 22:30:09 +0000"  >&lt;p&gt;This bug work on 10gen repo version and on manual build too.&lt;/p&gt;</comment>
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