#4928: Add primops for copying/cloning an array
------------------------------+---------------------------------------------
Reporter: tibbe | Owner: simonmar
Type: feature request | Status: patch
Priority: normal | Milestone: 7.4.1
Component: Runtime System | Version: 7.0.1
Resolution: | Keywords:
Testcase: | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: None/Unknown |
------------------------------+---------------------------------------------
Comment(by tibbe):
`copyArray#` spends more time in the C-- code so perhaps there's room for
optimization there:
{{{
$ perf record -f ./bench copyArray# 32 10000000
copyArray#: 0.354839s
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.083 MB perf.data (~3624 samples) ]
$ perf report
# Samples: 3564
#
# Overhead Command Shared Object Symbol
# ........ ............... ................... ......
#
58.89% bench ./bench [.] stg_copyArrayzh
34.37% bench /lib/libc-2.11.1.so [.] memcpy
3.11% bench ./bench [.] s233_info
1.71% bench ./bench [.] s235_info
1.43% bench ./bench [.] memcpy@plt
0.03% perf_2.6.32-gg4 [kernel] [k] audit_syscall_exit
0.03% perf_2.6.32-gg4 [kernel] [k] format_decode
0.03% perf_2.6.32-gg4 [kernel] [k] memcpy_c
0.03% bench [kernel] [k] up_read
0.03% bench [kernel] [k] filemap_fault
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4928#comment:20>
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