Slow "Verify" operation when copy with verification

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evgeniy
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Slow "Verify" operation when copy with verification

Post by *evgeniy » 2019-08-26, 00:38 UTC

Total commander version : 9.22a, 9.20, 64bit and 32bit
OS: windows 7
hardware: i5-2400, 16gb RAM

When I copy with verification directories with many big files, I found, than "Verify" part of operation works slow - about 110-114 MBytes/sec, but md5 calculation for same files on same drive works much faster (with full read speed of drive, sata HDD, up to 190 MBytes/sec).

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ghisler(Author)
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Re: Slow "Verify" operation when copy with verification

Post by *ghisler(Author) » 2019-08-26, 13:56 UTC

That's because "Verify" bypasses the disk cache, otherwise it would be pointless. md5 calculation uses the cache, so when you just copied a file and then calculate its md5, the data will be taken from the disk cache and no real write verification will be performed.
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