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Re: Regression of speed in lzip-1.25-rc1


From: wrotycz
Subject: Re: Regression of speed in lzip-1.25-rc1
Date: Thu, 05 Dec 2024 19:54:12 +0100
User-agent: GWP-Draft


I guess the cause is in your compiler, because the compression code has not
changed between 1.24 and 1.25.

Turns out that was compiled with Clang. Confusion come from the fact that when I checked strings for GCC and got exactly the same as with v1.25-rc1
~~~
$ strings prog | grep GCC:
~~~

But when dug a bit the net I found this tool:
~~~
$ objdump -s --section .comment prog
~~~

that shown clang along with GCC, therefore I had to conclude it was compiled with Clang.

Sorry for false alarm.

--

Plzip faster compression and slower decompression is still a thing.

~~~
$ time lzip-1.25-rc1 -kf mozilla 

real    0m48.818s
user    0m48.310s
sys     0m0.248s

$ time plzip-1.12-rc1 -kf -n1 mozilla 

real    0m43.435s
user    0m43.165s
sys     0m0.290s

$ time for i in `seq 1 10`; do lzip-1.25-rc1 -t mozilla.lz; done

real    0m21.027s
user    0m20.726s
sys     0m0.222s

$ time for i in `seq 1 10`; do plzip-1.12-rc1 -t mozilla.lz; done

real    0m23.625s
user    0m23.323s
sys     0m0.224s
~~~



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