[Bug threads/13251] New: frequent multithreading slows down GDB tothe extent of making it unusable

["markus at hyperion-imrt dot org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13251

             Bug #: 13251
           Summary: frequent multithreading slows down GDB to the extent
                    of making it unusable
           Product: gdb
           Version: 7.3
            Status: NEW
          Severity: critical
          Priority: P2
         Component: threads
        AssignedTo: unassigned@sourceware.org
        ReportedBy: markus@hyperion-imrt.org
    Classification: Unclassified


This is a follow-up on a bug that was submitted by me in Feb 2011 and never
resolved fully. I waited for 7.3 and it is still there.

The problem: the application program spawns a great many threads (in the
thousands, altogether) which each lives for a few ms. The threads are started
by boost::thread.

Each thread seems to allocate some memory in gdb which is never freed fully.
Further, the gdb process does something on a single CPU which grows longer in
time the more threads have been started (and stopped). With the growing
overhead
on a single CPU, performance drops rapidly. In the end, the process grinds to 
a halt, with GDB using all of one CPUÂs capacity.

Following my first submission, I installed gdb-7.2.50-20110206 which was only a 
partial rememedy.

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