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From "Internal Jenkins (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-4291: Reduce LLVM module's preparation time
Date Fri, 14 Oct 2016 03:02:35 GMT
Internal Jenkins has submitted this change and it was merged.

Change subject: IMPALA-4291: Reduce LLVM module's preparation time
......................................................................


IMPALA-4291: Reduce LLVM module's preparation time

Previously, when creating a LlvmCodeGen object, we
run an O(mn) algorithm to map the IRFunction::Type
to the actual LLVM::Function object in the module.
m is the size of IRFunction::Type enum and n is
the total number of functions in the module. This
is a waste of time if we only use few functions
from the module.

This change reduces the preparation time of a simple
query from 23ms to 10ms.

select count(*) from tpch100_parquet.lineitem where l_orderkey > 20;

Change-Id: I61ab9fa8cca5a0909bb716c3c62819da3e3b3041
Reviewed-on: http://gerrit.cloudera.org:8080/4691
Reviewed-by: Michael Ho <kwho@cloudera.com>
Tested-by: Internal Jenkins
---
M be/src/codegen/gen_ir_descriptions.py
M be/src/codegen/llvm-codegen.cc
2 files changed, 175 insertions(+), 123 deletions(-)

Approvals:
  Michael Ho: Looks good to me, approved
  Internal Jenkins: Verified



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Gerrit-MessageType: merged
Gerrit-Change-Id: I61ab9fa8cca5a0909bb716c3c62819da3e3b3041
Gerrit-PatchSet: 5
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Michael Ho <kwho@cloudera.com>
Gerrit-Reviewer: Internal Jenkins
Gerrit-Reviewer: Michael Ho <kwho@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstrong@cloudera.com>

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