[pve-devel] [PATCH-SERIES v2 qemu, qemu-server, manager 0/1] add tcmalloc support

Alexandre Derumier aderumier at odiso.com
Tue May 16 13:22:07 CEST 2023

This patches series add support for tcmalloc allocator with a new optionnal
tuning option in qemu-server.

tcmalloc improve librbd performance by 30% in latency and iops.

some performance bench results:

malloc: 60k iops 4k randread
tcmalloc : 90k iops 4k randread

a qemu patch is provided, to detect if a different memory allocator than
glibc malloc is loaded through LD_PRELOAD, to avoid the call of malloc_trim().
I don't have seen crash without this patch, but it's safer with it,
and as it's called 3-4x by second, it'll avoid some unnecessary calls.

changelog v2:

- update qemu patch for qemu 8.0


Alexandre Derumier (1):
  add patch: add memory allocator detection and use malloc_trim for
    glibc only

 ...-and-call-malloc_trim-only-for-glibc.patch | 163 ++++++++++++++++++
 debian/patches/series                         |   1 +
 2 files changed, 164 insertions(+)
 create mode 100644 debian/patches/pve/0063-detect-allocator-and-call-malloc_trim-only-for-glibc.patch


Alexandre Derumier (1):
  qemu options: add tuning allocator

 PVE/QemuServer.pm | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)


Alexandre Derumier (1):
  ui: qemu : add tuning option


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