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From "weldon washburn (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-4489) [drlvm][thread] Threads consume too much memory
Date Sat, 04 Aug 2007 14:27:54 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-4489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

weldon washburn closed HARMONY-4489.
------------------------------------

    Resolution: Fixed

patch has been applied

> [drlvm][thread] Threads consume too much memory
> -----------------------------------------------
>
>                 Key: HARMONY-4489
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4489
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Linux 32/64
>            Reporter: Aleksey Shipilev
>            Priority: Critical
>         Attachments: HARMONY-4489.patch, HARMONY-4489.patch, StackTest.java, Test.java
>
>
> Harmony consumes too much memory for threads while running on Linux, either x86 or x86_64.

> A simple test (Test.java) creates N empty threads before memory running out, so it is
possible to  measure how much each thread takes.
> During run two points were taken: "reference", some time after the test starts and "final",
when test stops. 
> Per-thread memory size was calculated as:
> Per-thread = [ VmSize(final) - VmSize(reference) ] / [ ThreadCount(final) - ThreadCount(reference)
]
> JREs used in comparison are:
>   1. Sun 1.6.0:
>       java version "1.6.0"
>      Java(TM) SE Runtime Environment (build 1.6.0-b105)
>      Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)
>   2. Harmony-r555193
>      Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation
or its licensors, as applicable.
>      java version "1.5.0"
>      pre-alpha : not complete or compatible
>      svn = r555193, (Jul 11 2007), Linux/ia32/gcc 3.4.2, release build
>  
>   3. apache-harmony-hdk-r555580-windows-x86-32-snapshot
>      Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation
or its licensors, as applicable.
>      java version "1.5.0"
>      pre-alpha : not complete or compatible
>      svn = r555256, (Jul 11 2007), Windows/ia32/msvc 1310, release build
> Test was performed 4 times on the following configurations:
>     a. -client (or -Xem:client)
>     b. -server (or -Xem:server)
>     c. -server -Xss128k
>     d. -server -Xms64M -Xmx64M -Xss128k
> Observations (details below):
>     1. Harmony @ Linux x86_64 consumes 10 Mb per empty thread regardless of -Xss setting
>     2. Harmony @ Linux x86 consumes 2 Mb per empty thread regardless of -Xss setting
>     3. Harmony @ Windows x86 works well and tunable via -Xss
>     4. Harmony @ Windows x86_64 works well and tunable via -Xss
>     5. Simple stack overflow test (attached  - StackTest.java) shows than the stack size
is changed via -Xss option on Linux too, but memory footprint remains that huge.
> This issue is critical since Harmony is unable to run significant amount of multi-threaded
applications on Linux.
> Details:
> On Linux64:
>      Linux linux64testbox 2.6.9-55.ELsmp #1 SMP Fri Apr 20 16:36:54 EDT 2007 x86_64 x86_64
x86_64 GNU/Linux
>  
>      Sun:
>         a. 12077 threads, 329 Kb/thread 
>         b. 9121 threads, 329 Kb/thread 
>         c. 21505 threads, 137 Kb/thread 
>         d. 29118 threads, 136 Kb/thread 
>      Harmony-r555193:
>         a. 332 threads, 10767 Kb/thread 
>         b. 352 threads, 10618 Kb/thread 
>         c. 352 threads, 10648 Kb/thread 
>         d. 351 threads, 11240 Kb/thread 
>       Notice 10 Mb per empty thread!
> On Linux32:
>       Linux linux32testbox 2.6.5-7.97-smp #1 SMP Fri Jul 2 14:21:59 UTC 2004 i686 i686
i386 GNU/Linux
>      Harmony-r555193:
>         a. 752 threads, 2061 Kb/thread 
>         b. 816 threads, 2059 Kb/thread 
>         c. 746 threads, 2061 Kb/thread 
>         d. 949 threads, 2061 Kb/thread 
>      apache-harmony-hdk-r555580-linux-x86-32-snapshot:
>         a. 752 threads, 2061 Kb/thread 
>         b. 816 threads, 2059 Kb/thread 
>         c. 746 threads, 2061 Kb/thread 
>         d. 949 threads, 2061 Kb/thread 
> On Windows x86:
>      apache-harmony-hdk-r555580-windows-x86-32-snapshot:
>         a. 2062 threads, 577 Kb/thread 
>         b. 2584 threads, 569 Kb/thread 
>         c. 8983 threads, 157 Kb/thread 
>         d. 10466 threads, 153 Kb/thread 
> On Windows x86_64:
>      apache-harmony-hdk-r555580-windows-x86-32-snapshot:
>         a. 4185 threads, 840 Kb/thread 
>         b. 4176 threads, 836 Kb/thread 
>         c. 8194 threads, 419 Kb/thread 
>         d. 8679 threads, 415 Kb/thread 

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