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A specific case for ThinLTO cache pruning is that the current build is huge, and the cache wasn't big enough to hold the intermediate object files of that build. So in doing that build, a file would be cached, and later in that same build it would be evicted. This was significantly decreasing the effectiveness of the cache. By giving this warning, the user could identify the required cache size/files and improve ThinLTO link speed. Differential Revision: https://reviews.llvm.org/D135590
44 lines
3.1 KiB
LLVM
44 lines
3.1 KiB
LLVM
; REQUIRES: x86, shell
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; RUN: opt -module-hash -module-summary %s -o %t.o
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; RUN: opt -module-hash -module-summary %p/Inputs/lto-cache.ll -o %t2.o
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; RUN: rm -rf %t && mkdir %t
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;; Check cache policies of the number of files.
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;; Case 1: A value of 0 disables the number of files based pruning. Therefore, there is no warning.
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; RUN: lld-link /verbose /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_files=0 /out:%t3 /entry:main %t2.o %t.o 2>&1 | FileCheck --implicit-check-not=warning: %s
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;; Case 2: If the total number of the files created by the current link job is less than the maximum number of files, there is no warning.
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; RUN: lld-link /verbose /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_files=3 /out:%t3 /entry:main %t2.o %t.o 2>&1 | FileCheck %s --implicit-check-not=warning:
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;; Case 3: If the total number of the files created by the current link job exceeds the maximum number of files, a warning is given.
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; RUN: lld-link /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_files=1 /out:%t3 /entry:main %t2.o %t.o 2>&1 | FileCheck %s --check-prefix=NUM
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;; Check cache policies of the cache size.
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;; Case 1: A value of 0 disables the absolute size-based pruning. Therefore, there is no warning.
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; RUN: lld-link /verbose /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_bytes=0 /out:%t3 /entry:main %t2.o %t.o 2>&1 | FileCheck %s --implicit-check-not=warning:
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;; Get the total size of created cache files.
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; RUN: rm -rf %t && mkdir %t && cd %t
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; RUN: lld-link /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_bytes=32k /out:%t3 /entry:main %t2.o %t.o 2>&1
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; RUN: %python -c "import os, sys; print(sum(os.path.getsize(filename) for filename in os.listdir('.') if os.path.isfile(filename) and filename.startswith('llvmcache-')))" > %t.size.txt
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;; Case 2: If the total size of the cache files created by the current link job is less than the maximum size for the cache directory in bytes, there is no warning.
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; RUN: lld-link /verbose /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_bytes=$(($(cat %t.size.txt) + 5)) /out:%t3 /entry:main %t2.o %t.o 2>&1 | FileCheck %s --implicit-check-not=warning:
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;; Case 3: If the total size of the cache files created by the current link job exceeds the maximum size for the cache directory in bytes, a warning is given.
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; RUN: lld-link /verbose /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_bytes=$(($(cat %t.size.txt) - 5)) /out:%t3 /entry:main %t2.o %t.o 2>&1 | FileCheck %s --check-prefix=SIZE
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;; Check emit two warnings if pruning happens due to reach both the size and number limits.
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; RUN: lld-link /lldltocache:%t /lldltocachepolicy:prune_interval=0s:cache_size_files=1:cache_size_bytes=1 /out:%t3 /entry:main %t2.o %t.o 2>&1 | FileCheck %s --check-prefixes=NUM,SIZE
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; NUM: warning: ThinLTO cache pruning happens since the number of{{.*}}--thinlto-cache-policy
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; SIZE: warning: ThinLTO cache pruning happens since the total size of{{.*}}--thinlto-cache-policy
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target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc"
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define void @globalfunc() #0 {
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entry:
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ret void
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}
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