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Re: cpio copy-pass mode ignores block size arguments ?
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From: |
Jean-Baptiste Denis |
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Subject: |
Re: cpio copy-pass mode ignores block size arguments ? |
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Date: |
Tue, 11 Jan 2022 07:33:20 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 |
Hi Sergey,
> This help message is misguiding, indeed. The block size is used when
> doing I/O with the archive storage, i.e. only in copy-in and copy-out
> mode. I'll fix the text. Thanks for reporting it!
Thank you for the confirmation !
FWIW, in my use case (copy between network filesystem), I saw big (x10)
performance improvement
recompiling with a 1MiB DISK_IO_BLOCK_SIZE with cpio only use in copy-pass mode.
Jean-Baptiste
On 1/11/22 7:28 AM, Sergey Poznyakoff wrote:
> Hi Jean-Baptiste,
>
>> Operation modifiers valid in any mode:
>> --block-size=BLOCK-SIZE Set the I/O block size to BLOCK-SIZE * 512
>> bytes
>> -B Set the I/O block size to 5120 bytes
>
> This help message is misguiding, indeed. The block size is used when
> doing I/O with the archive storage, i.e. only in copy-in and copy-out
> mode. I'll fix the text. Thanks for reporting it!
>
> Best regards,
> Sergey
>