[Mono-bugs] [Bug 634721] New: GC Warning: Limiting number of mark threads

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https://bugzilla.novell.com/show_bug.cgi?id=634721

https://bugzilla.novell.com/show_bug.cgi?id=634721#c0


           Summary: GC Warning: Limiting number of mark threads
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.6.x
          Platform: 64bit
        OS/Version: RHEL 4
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: GC
        AssignedTo: lupus at novell.com
        ReportedBy: sbasovnik at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


Description of Problem:

I have installed mono 2.6.4 on 24-core machine and during xbuild or running
application the following warning occures:

GC Warning: Limiting number of mark threads

I have found in mono-2.6.4/libgc/pthread_support.c these lines of code:


#ifdef PARALLEL_MARK

# ifndef MAX_MARKERS
#   define MAX_MARKERS 16
# endif

..

    if (GC_markers > MAX_MARKERS) {
    WARN("Limiting number of mark threads\n", 0);
    GC_markers = MAX_MARKERS;
    } 
..

What does GC_MARKERS mean and why it is limited to 16 ?

It is just warning, but the CPU usage on my machine is about 1000% instead of
supposed 20000% (maximum is 24000%).

Many thanks in advance.

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