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Re: [Nmh-workers] Slowdown with a Populated Folder.

From: Ralph Corderoy
Subject: Re: [Nmh-workers] Slowdown with a Populated Folder.
Date: Wed, 01 Jan 2014 19:27:51 +0000

Hi Ken,

> So when things start to bog down, how many files ARE in that
> directory?

I didn't count, but I would guess more like 10-12,000 rather than 7,000.
But!  The ,* filenames are long, `1234' becoming
`,42,1388604144.004903932', so getdents(..., 32KiB)'s throughput is

> I am looking at the critical part of folder_read(), and it doesn't
> feel like we're doing much in there that that should slow things down
> when it's not a message (unless atoi() ends up being slow).

Agreed.  About the only obvious thing would be to do the `.' and `,'
continue before the m_atoi(), but then for many people, [0-9]* may swamp
,* in volume.

As an aside, this gives a base-94 encoded datestamp mapped onto
printable `!' through to `~', giving better getdents() throughput.  :-)

    dc <<<94o`date +%s%N`p |
    sed 's/^0$/ 00/; s/ ../33&+P/g; s/$/10P/' |

Cheers, Ralph.

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