I am new to LZMA SDK and I got into the comprssion properties which are the ones listed here:
My question is, which is the best combination for speed? I have used the 7ZipManager and it compressed 1.2GB in about 11 seconds but using the LZMA SDK the best time I got was 40 seconds.
I have a powerful computer with 64GB of RAM and 16-core CPU.
The settings I used for the 40 seconds result was:
props.lzmaProps.level = 0;
props.lzmaProps.writeEndMark = 1;
props.lzmaProps.numThreads = 16;
props.numTotalThreads = 16;
props.numBlockThreads = 4;
props.lzmaProps.dictSize = 1024 * 1024;
props.lzmaProps.btMode = 0;
props.lzmaProps.algo = 0;
props.lzmaProps.numHashBytes = 2;
props.lzmaProps.lc = 0;
props.lzmaProps.lp = 4;
props.lzmaProps.pb = 4;
I also tried to map the settings from the 7 Zip Manager GUI to code but I didn't even nearly as close as 40 seconds...
Can anyone help me with this?
call Lzma2EncProps_Init at first
props.numTotalThreads = 16; // set 32, if you have 16 cores with hyperthreading
props.lzmaProps.level = 5; // you can change it from 1 to 9
You don't need to set another options in most cases.
Hello Igor. Thank you for your answer!
I managed to make it use all the cores 100% and compression is as fast as I was expected it to be, however decompression doesn't use the full power of the machine.
I am using Lzma2Enc_WriteProperties(enc); to get the properties Byte which I use on the decompression side for Lzma2Dec_Allocate(&dec, propsByte, &m_szAllocForLzma);
Is it possible to decompress on all the cores, full power?
Thanks a lot for your help!
Current lzma2 decompression code uses only single thread.
I understand. Now it's clear
Thank you, Igor!
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