Question

我正在尝试分析一个程序的数字，它具有一些依赖性。 Per Aleksander Dmitrov在Profile Haskell without installing installing profiling libraries for all dependencies中的答案，我正在使用cabal-dev来（尝试）构建所有依赖项并启用分析。我试过了

cabal-dev install --config=./cabal-dev.config，其中cabal-dev.config为

library-profiling: True
executable-profiling: True
package-db: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/packages-7.6.1.conf
local-repo: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/packages
user-install: False
remote-repo: hackage.haskell.org:http://hackage.haskell.org/packages/archive
remote-repo-cache: /home/christopher/.cabal/packages
optimization: True
build-summary: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/logs/build.log
remote-build-reporting: anonymous
optimization: True

install-dirs user
  prefix: /home/christopher/school/senior/senior_thesis/windingnumber_integration/cabal-dev/
install-dirs global

cabal-dev install --cabal-install-arg='--enable-library-profiling' --cabal-install-arg='--enable-executable-profiling'

（当然，rm -rf cabal-dev介于两者之间，从原始环境开始。）在每种情况下，我得到：

arch% cabal-dev/bin/windingnumber +RTS -p
cabal-dev/bin/windingnumber +RTS -p
windingnumber: the flag -p requires the program to be built with -prof
windingnumber: 
windingnumber: Usage: <prog> <args> [+RTS <rtsopts> | -RTS <args>] ... --RTS <args>
<snip>

---即，未启用分析。我该如何启用它？

ETA解决方案：将-prof添加到项目的.cabal文件中的ghc-options中。显然在cabal-dev配置中设置`executable-profiling：True'并没有这样做。感谢Daniel Fischer。

Answer 1

每次运行时cabal-dev都会重写./cabal-dev/cabal.config。但是，您可以修改~/.cabal/share/cabal-dev-$VERSION/admin/cabal-config.in以设置默认值：

$  vim ~/.cabal/share/cabal-dev-0.9.1/admin/cabal-config.in
# Set executable-profiling and library-profiling to True
$ cabal unpack ghc-core
$ cd ghc-core-0.5.6
$ cabal-dev install --dependencies-only
$ cabal-dev configure -p
$ cabal-dev build
$ ./dist/build/ghc-core/ghc-core +RTS -p
# much success

如果您不想为使用cabal-dev管理的所有项目启用分析，请使用--extra-config-file选项（--config只设置自动生成的配置文件的位置）：

$ cat cabal-dev.config 
executable-profiling: True
library-profiling: True
$ cabal-dev --extra-config-file='./cabal-dev.config' install
$ ./cabal-dev/bin/ghc-core +RTS -p
# success

建议不要使用.cabal文件中的ghc-options字段来启用性能分析 - 您不希望从Hackage安装程序包的每个人都使用性能分析进行构建。使用cabal-dev configure -p --ghc-options="-fprof-auto"仅对当前构建启用分析。

如何在cabal-dev安装中启用分析？

1 个答案: