BandiZip 7Z slow compression?

[hex...@gmail.com]

Some benchmarks here https://peazip.github.io/peazip-compression-benchmark.html

... and beside this is the PeaZip site, I can confirm 7Z compression is usually quite slow with BandiZip, sometimes twice the time it takes with 7zip or others.

Wondering if could be improved a bit...

[KH Park]

1) Peazip has 7z.exe itself, so its 7z performance is always equal to 7zip.

2) Bandizip uses LZMA SDK to create 7z files, so its performance isn't so different from 7zip.

For example, I have tested a simple test like this.

- Create a sample file using LZ data generator (https://github.com/jibsen/lzdatagen)

  ./lzdgen -s 1G 1g.data

- Compress it using 7z

- Compress it using bz

The result could be changed when you change compression options.

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[Luca L]

Thanks for testing.

Following your steps I tried the same on a more complex archive (a game dir with many files of different dimensions, over 512MB of data):

PS D:\GOG\Games> Measure-Command { bz a -r bz.7z .\Flashback\ }

Days              : 0

Hours             : 0

Minutes           : 1

Seconds           : 26

Milliseconds      : 668

Ticks             : 866685193

TotalDays         : 0,00100310786226852

TotalHours        : 0,0240745886944444

TotalMinutes      : 1,44447532166667

TotalSeconds      : 86,6685193

TotalMilliseconds : 86668,5193

PS D:\GOG\Games> Measure-Command { C:\Users\Luca\Desktop\7z1900-x64\7z.exe a -r 7z.7z .\Flashback\ }

Days              : 0

Hours             : 0

Minutes           : 0

Seconds           : 25

Milliseconds      : 361

Ticks             : 253617242

TotalDays         : 0,000293538474537037

TotalHours        : 0,00704492338888889

TotalMinutes      : 0,422695403333333

TotalSeconds      : 25,3617242

TotalMilliseconds : 25361,7242

PS D:\GOG\Games>

[KH Park]

You are right.

I made a big mistake. :( 

Bandizip 7.10 has a problem of slowing down when compressing small files (Nkb  ~ Nmb) to 7z format.

 

I have fixed it and you can download it here, and I should improve it.

https://www.bandisoft.com/bandizip/beta/

Thank you.

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[Luca L]

Works like a charm now!

Even a bit faster than original 7z.exe ;)

Thank you!

PS D:\GOG\Games> Measure-Command { bz a -r bz.7z .\Flashback\ }

Days              : 0

Hours             : 0

Minutes           : 0

Seconds           : 24

Milliseconds      : 907

Ticks             : 249073490

TotalDays         : 0,000288279502314815

TotalHours        : 0,00691870805555555

TotalMinutes      : 0,415122483333333

TotalSeconds      : 24,907349

TotalMilliseconds : 24907,349

PS D:\GOG\Games>

[Luca L]

BTW, I've noticed bz.exe from shell result is ~154MB. Compressing the same files from BandiZip UI (Normal 7Z compression, Solid mode) compress it to ~145...

[KH Park]

Yes. An archives' compressed size and compression time could be varied by its LZMA2 block size and dictionary size settings.

You could change 7z block size here.

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[Luca L]

How to set-up default Solid block size for the shell command bz.exe (system variable or ini/cfg file?).

My suggestion, in case, would be to centralize Solid block size settings for both bz.exe and BandiZip UI ( = a single setting for both)...

[KH Park]

7Z block size can be configured by -7zblock: switch like this

> bz.exe c -7zblock:10m  test.7z test

-7zblock:0 means non-solid and,  

-7zblock:-1 means solid but you have to install the latest beta first here. https://www.bandisoft.com/bandizip/beta/

Bandizip.exe uses the command line option first, and refers to registry options later.

On the other hand, bz does not refer to any registry values.

They have similar command line commands but work differently.

Best regards.

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[Luca L]

Thanks for explanations, I'm sure you'll update also the Command Line online Help page once public...
BTW, what does Solid option alone do compared to when you specify the Solid size?

[KH Park]

>> Thanks for explanations, I'm sure you'll update also the Command Line online Help page once public...

Sure, I'll document it later.

>> BTW, what does Solid option alone do compared to when you specify the Solid size?

Solid (whole solid) compression compresses all data into one block, and multiple solid block compression is described here.

https://en.bandisoft.com/bandizip/help/what-is-solid-compression/  

(Please check "Compression with multiple solid blocks" section)

Best Regards, 

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