Internal Arc LZMA vs external LZMA2

[danswano]

Hello,
Should i consider switching to external lzma2 instead of internal lzma for better compression ratio?
What do you suggest to get the best ratio out of lzma?

[FitGirl]

LZMA2 usually have worster compression ratio than LZMA1, but can be faster due to saving of uncompressible blocks as is.

[Chayan Manna]

You can better the compression ratio with LZMA 1 by increasing the RAM usage. That is like "d512" parameter. Increase the value of "d" ( that memory is needed to decompress) & you will get better ratio, of course other parameters must be set correctly. Decompression will be faster also but will use more RAM.

[danswano]

I'm using these parameters and i can't seems to get a better compression ratio out of it no matter what i adjust
"lzma:a1:mfbt4:d180m:fb273:mc10000:lc8"
what's the better version of these parameters would be as you suggest?

[shazzla]

imho its the best.
increase d180m to d1024m if you have enought RAM.

[doofoo24]

Originally Posted by danswano

I'm using these parameters and i can't seems to get a better compression ratio out of it no matter what i adjust
"lzma:a1:mfbt4:d180m:fb273:mc10000:lc8"
what's the better version of these parameters would be as you suggest?

you need to use fazip 64x for lzma beyond d184mb because lzma built-in freearc is limited..

[External compressor:mm,dispack070,rep,tor,delta,4x4,lzma]
header = 0
packcmd = fazip -i0 compress:{compressor}{:option} <stdin> <stdout>

[ChronoCross]

First at all internal arc LZMA is 32bit so you have a memory limitation thats why lzma_x64 was created you can use 4gb of memory the same thing with srep x64. external x64 always is better than internal x86.(fazip_x64 is the best !!!!)
LZMA and LZMA2 are different.
LZMA Better for compression ratio.
LZMA2 Better for time decompression .

[LuzhinE]

ChronoCross:

Then how would the parameters for fazip and srep X64 to use 4gb decompression

[ChronoCross]

I think you confused, 4gb in decompression is a requirement and not an optimization.
The optimization would be to limit the memory to decompress.
This would be during the compression in freearc "-ld512".
You can use 4gb for compress and then 512mb to decompress.

[1234567890123]

can someone give fazip x64 i haven't found it in freearc's site is broken and is there x64 arc.exe ?

[Chayan Manna]

Originally Posted by 1234567890123

can someone give fazip x64 i haven't found it in freearc's site is broken and is there x64 arc.exe ?

Here's Fazipx64.

[LuzhinE]

I used this parameter and it works.
lzma:a1:mfbt4:d180m:fb273:mc10000:lc8

But change d180m by :d256m and it takes longer to compress, but compresses a little more.

My question is, how do I use my cpu 100% because in the image it is only seen that it uses 50% when compressing

[Simorq]

Originally Posted by LuzhinE

I used this parameter and it works.
lzma:a1:mfbt4:d180m:fb273:mc10000:lc8

But change d180m by :d256m and it takes longer to compress, but compresses a little more.

My question is, how do I use my cpu 100% because in the image it is only seen that it uses 50% when compressing

[External compressor:rep,mm,delta,exe,exe2,4x4,lzma]
header = 0
packcmd = FAZip64 -i0 compress:{compressor}{ption} <stdin> <stdout>
unpackcmd = FAZip64 -i0 decompress:{compressor}{ption} <stdin> <stdout>

4x4:lzma: a1: mfbt4: d180m: fb273: mc10000: lc8
But the more RAM