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`time ( someCmd )` Doesn't Print Time Under 5.2
From: |
dabe |
Subject: |
`time ( someCmd )` Doesn't Print Time Under 5.2 |
Date: |
Mon, 21 Nov 2022 19:07:08 -0500 (EST) |
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: darwin22.1.0
Compiler: clang
Compilation CFLAGS: -DSSH_SOURCE_BASHRC
uname output: Darwin triton.parabon.com 22.1.0 Darwin Kernel Version 22.1.0:
Sun Oct 9 20:14:54 PDT 2022; root:xnu-8792.41.9~2/RELEASE_X86_64 x86_64
Machine Type: x86_64-apple-darwin22.1.0
Bash Version: 5.2
Patch Level: 9
Release Status: release
Description:
Under 5.2.x, measuring the `time` of a subshell -- `time ( sleep 1 )`
for example -- doesn't display any timing information,
whereas `5.1.x` and before did.
Builtins work[*] but if "someCmd" includes an external program, bupkis:
bash-5.2% time ( sleep 1 ) # No timing output
bash-5.2% time ( sleep 1 </dev/null ) # Okay
bash-5.2% time ( sleep 1 >/dev/null ) # Okay
bash-5.2% time ( sleep 1 ) </dev/null # No timing output
bash-5.2% time ( sleep 1 ) >/dev/null # No timing output
bash-5.2% time ( sleep 1 ) | cat # Okay
bash-5.2% time ( sleep 1 ) > >(cat) # No timing output
bash-5.2% time ( exec 2>/dev/null; : ) # Builtin(s), but no timing
output (/dev/fd/2 leaks?)
bash-5.2% time ( echo Hi ) # Okay (Builtin)
bash-5.2% time ( exec echo Hi ) # No timing output
bash-5.2% time ( eval echo Hi ) # Okay
bash-5.2% time ( eval sleep 1 ) # Okay (...!)
bash-5.2% time ( eval exec echo Hi ) # No timing output
bash-5.2% time ( { sleep 1; } ) # Okay, FWIW
bash-5.2% time { ( sleep 1 ); } # Okay, FWIW
emanuele6 suspects it has to do with
https://lists.gnu.org/archive/html/bug-bash/2022-10/msg00107.html
Also:
<emanuele6> i tried to run this script bash 5.2 with little memory
<emanuele6> .source_code/bash/bash -c 'ulimit -v 5000; for (( x = 0;
i < 2000000; ++i )); do echo "$i"; time (:); done'
<emanuele6> it fails after 20 calls with OOM
<emanuele6> and in bash 5.1, that code runs without problems