On 4/19/15, 5:24 PM, "Chet Ramey" wrote:
>On 4/17/15 4:55 PM, John Fremlin wrote:
>> Did some benchmarks, for the while true; do (:) & (:); done simple
>>example
>> this goes from 215 to 313 iterations/s, and changes sys+user CPU from
>>152%
>>
Did some benchmarks, for the while true; do (:) & (:); done simple example
this goes from 215 to 313 iterations/s, and changes sys+user CPU from 152%
to 45%
Any long running bash script will tend to exhibit this issue --
On 4/15/15, 5:59 PM, "John Fremlin" wrote:
>Over tim
On 4/15/15, 6:35 PM, "Chet Ramey" wrote:
>On 4/14/15 12:54 AM, John Fremlin wrote:
>> Bash instances running in loops get slower over time, as the bgpids data
>> structure grows. Here is a small patch to alleviate one issue :)
>>
>> The jobs.c:bgpids data
it is dominated by copying page table entries on fork
user 94.14
sys 657.74
Without patch most time is spent in bgp_* functions
user 1637.16
sys 1337.58
Number of iterations of this busy loop is much higher with the patch too :)
Any feedback much appreciated!
From: John Fremlin
Date: Mond
Bash instances running in loops get slower over time, as the bgpids data
structure grows. Here is a small patch to alleviate one issue :)
The jobs.c:bgpids data structure is used as a cache for the wait syscall, to
store the status of dead processes, so that scripts can wait on pids even
multip
