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[Bug libc/11770] New: Per thread memory allocator uses too much address space
- From: "nauch at sybase dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 30 Jun 2010 15:51:25 -0000
- Subject: [Bug libc/11770] New: Per thread memory allocator uses too much address space
- Reply-to: sourceware-bugzilla at sourceware dot org
The first allocation made on a thread calls into _int_new_arena which in turn
calls new_heap which in turn reserves address space for the thread heap using
mmap. On 64-bit platforms, the default size of this heap (as set by
HEAP_MAX_SIZE) is 64mb. When many threads are created the amount of address
space used by the process grows quickly.
Normally this is not a problem, but when the process is run with a restricted
address space (via ulimit -v) the limit gets hit sooner than seems reasonable.
Some distributions (SuSE) are known to set a default address space limit to 80%
of physical ram + swap.
On 32-bit platforms the default value of HEAP_MAX_SIZE is 1mb because the
available address space is limited to 32-bit addressing. Perhaps a smaller value
of HEAP_MAX_SIZE should also be used if the address space of the process is
limited by resource limits.
--
Summary: Per thread memory allocator uses too much address space
Product: glibc
Version: 2.12
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: drepper at redhat dot com
ReportedBy: nauch at sybase dot com
CC: glibc-bugs at sources dot redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=11770
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