Precomp hard to batch multithread and doesn like big files

[SvenBent]

Found 2 issues with Precomp

I'm running af lot of compression utilities through bat files. to gain a multithreading performance edge.
However its not possible to run precomp multi instances in the same directory.
Couldn't it be fxed by using random named temp files ?

and also
Precomp seem not to support big files (4gb+)
its kinda S#X going through precomp -brute on a 5.53GB file an se the resulting file not works

[Black_Fox1]

As a workaround, try splitting it before precomping

[Simon Berger]

But with splitting you may split important streams

[schnaader]

Couldnt it be fxed by using random named temp files ?

Hopefully, the next version will not use temp files anymore but do everything in memory, but if it still does, random names will be used.

Precomp seem not to support big files (4gb+)

I think its even 2 GB. 2 GB+ file support will be in the next version.

But with splitting you may split important streams

Most streams are <1 MB in size and large streams of ZIP or PNG
data that are >1 MB in size will fail to recompress most time, so there wont be much difference. And its still better than not precompressing at all...
A major drawback on splitting is that you have to split so that not only the input files are <2 GB, but also the output PCF files whose size you cant know. Most times, splitting in 500 MB or 1 GB parts will be enough, but if there are many large image streams, even 100 MB can grow to over 2 GB.

[SvenBent]

i got some 700mb iso that grew to 1.3gb after Precomp.

including Precomp shaved off 20mb of the end files

So it earned its place in my bathc files.

actually I'm brute forcing

Org -> RZM
Org -> rep -> rzm
Org -> Precomp -> rzm
Org -> Precomp -> rep -LZM
Org -> delta -> RZM
Org -> delta -> rep -> rzm
Org -> Precomp ->delta -> rzm
Org -> Precomp ->delta -> rep -LZM