Michael Ho has uploaded this change for review. (
http://gerrit.cloudera.org:8080/9058
Change subject: IMPALA-5528: Bump total thread cache size when KRPC is enabled
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IMPALA-5528: Bump total thread cache size when KRPC is enabled
KRPC in general tends to put more pressure on the thread
caches due to allocations of more small objects (i.e. <1MB).
While some of them are being addressed in KUDU-1865, it's shown
that the following TCMalloc workarounds will provide reasonable
performance with KRPC:
- TCMALLOC_TRANSFER_NUM_OBJ:
- maximum number of object per classe type to transfer between
thread and central caches.
- the default value of 512 in 2.5.2 seems to cause the spin lock
in the central cache to be held for too long with KRPC. 2.5.90
and latter reverts this value to 32 by default.
- TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES
- total amount of memory allocated to all thread caches in bytes
- the default value is 32MB. We need to bump it to 1GB which is the
internal cap in TCMalloc.
This change bumps the thread cache sizes to 1GB when KRPC is enabled and
FLAGS_TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES has the default value of 0.
TCMALLOC_TRANSFER_NUM_OBJ will be tuned in a separate change. Previous attempt
to upgrade GPerfTools to 2.6.3 failed on certain platforms (IMPALA-6414).
Change-Id: I8407528942051fb19a0222491347c9090d4b4b8d
---
M be/src/runtime/exec-env.cc
1 file changed, 12 insertions(+), 10 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/58/9058/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I8407528942051fb19a0222491347c9090d4b4b8d
Gerrit-Change-Number: 9058
Gerrit-PatchSet: 1
Gerrit-Owner: Michael Ho <[email protected]>
