<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>89940</bug_id>
          
          <creation_ts>2012-06-25 19:49:42 -0700</creation_ts>
          <short_desc>JSC should try to make profiling deterministic because otherwise reproducing failures is nearly impossible</short_desc>
          <delta_ts>2012-06-25 19:54:16 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>JavaScriptCore</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>All</rep_platform>
          <op_sys>All</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          <dependson>89802</dependson>
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Filip Pizlo">fpizlo</reporter>
          <assigned_to name="Filip Pizlo">fpizlo</assigned_to>
          
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>657201</commentid>
    <comment_count>0</comment_count>
    <who name="Filip Pizlo">fpizlo</who>
    <bug_when>2012-06-25 19:49:42 -0700</bug_when>
    <thetext>We should in future do more exploration of the stochastic profiling from https://bugs.webkit.org/show_bug.cgi?id=89802.  But without some sort of record-replay mode, this sort of randomness greatly increases the work required to narrow in on compiler bugs.

This bug is concerned with just removing the random part of http://trac.webkit.org/changeset/121215.  It still leaves the ability to periodically compute least-upper-bounds of value profiles by setting an artificially low execution count threshold.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>657202</commentid>
    <comment_count>1</comment_count>
    <who name="Filip Pizlo">fpizlo</who>
    <bug_when>2012-06-25 19:50:31 -0700</bug_when>
    <thetext>Rubber-stamped in person by Gavin Barraclough.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>657207</commentid>
    <comment_count>2</comment_count>
    <who name="Filip Pizlo">fpizlo</who>
    <bug_when>2012-06-25 19:54:16 -0700</bug_when>
    <thetext>Landed in http://trac.webkit.org/changeset/121218</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>