[stlport-bugs] [ stlport-Bugs-1720635 ] Multiprocessor performance problems (Windows 2003)

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Bugs item #1720635, was opened at 2007-05-17 14:05
Message generated for change (Settings changed) made by o-taras
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Category: Operational Environment/Compiler specific code
Group: None
>Status: Closed
>Resolution: Duplicate
Priority: 1
Private: No
Submitted By: Taras Overchuk (o-taras)
Assigned to: Nobody/Anonymous (nobody)
Summary: Multiprocessor performance problems (Windows 2003)

Initial Comment:
Currently we faced a problem with performance of STLPort on multiprocessor
machine (Windows 2003). 
After some investigation it was found that the problem is in
_STLP_mutex_base implementation for Windows. 

It uses Sleep(1) to resolve concurrency and this leads to performance problems because:
- Sleep(1) call is often reached on multiprocessor platform
- Sleep(1) can actually take 15 msec and it is too long

As a result multithreaded application uses max 10% of CPU and sleeps most of the time 

BTW boost doesn't use Sleep(1) for its lightweight mutex any more (original code contains reference to boost.org).

OPERATIONAL ENVIRONMENT:
  - Windows 2003 Server 
  - 4 x Intel Xeon CPU 5150 @ 2.66GHz, 2.00 GB RAM
COMPILER VERSION:
  - VC++ 7.1 (.NET 2003)
STLPORT VERSION
  - 4.6.2
  - 5.3.1
RESULT OF UNIT TESTS
  See attached Tests.zip. It contains:
  - test sources
  - possible patch (for 4.6.2 version)
  - readme.txt file with reproducing instructions and tests results.

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Comment By: Taras Overchuk (o-taras)
Date: 2007-05-17 14:40

Message:
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Originator: YES

5.1.3 instead of 5.3.1

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Comment By: Petr Ovtchenkov (complement)
Date: 2007-05-17 14:35

Message:
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Originator: NO

STLport 4.6 is unsupported (and never was supported).

I know nothing about STLport 5.3.1. At least it not maintained here.

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https://sourceforge.net/tracker/?func=detail&atid=766244&aid=1720635&group_id=146814