Dan Hecht has posted comments on this change. Change subject: IMPALA-5073: Use mmap() instead of malloc() for buffer pool ......................................................................
Patch Set 7: (4 comments) http://gerrit.cloudera.org:8080/#/c/6474/7/be/src/runtime/bufferpool/system-allocator.cc File be/src/runtime/bufferpool/system-allocator.cc: Line 81: munmap(mem, fixup); does this path occur normally? how expensive are these 2 extra munmap()s? hmm, I guess linux doesn't support something like MAP_ALIGNED_SUPER. http://gerrit.cloudera.org:8080/#/c/6474/7/be/src/util/memory-metrics.h File be/src/util/memory-metrics.h: PS7, Line 39: in use what does that mean? i.e .does it include buffers in the free lists and TCMalloc free lists? PS7, Line 158: Total amount of buffer memory currently allocated. it's hard to tell from this comment (and naming) if this is the total allocated by clients, amount of buffer reservation allocated (in reservation tracker terms), or the total system memory allocated (even if in free list). PS7, Line 159: buffer memory reserved for buffers not sure what that means. isn't all "buffer memory" reserved for buffers? -- To view, visit http://gerrit.cloudera.org:8080/6474 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: comment Gerrit-Change-Id: Ifbc748f74adcbbdcfa45f3ec7df98284925acbd6 Gerrit-PatchSet: 7 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com> Gerrit-Reviewer: Dan Hecht <dhe...@cloudera.com> Gerrit-HasComments: Yes
