Re: [PATCH] Teach "git add" and friends to be paranoid

From: Junio C Hamano <gitster@pobox.com>
Date: Feb 22, 2010, 06:59 UTC
Message-ID: <7vwry5pxg8.fsf@alter.siamese.dyndns.org>
In-Reply-To: <20100222033553.GA10191@dpotapov.dyndns.org>

Dmitry Potapov <dpotapov@gmail.com> writes:

> If you look at speed-up numbers, you can think that the numbers are
> unstable, but in fact, the best time in 5 runs does not differ more
> than 0.01s between those trials. But because difference for >=128Kb
> is 0.05s or less, the accuracy of the above numbers is less than 25%.

Then wouldn't it make the following statement...

> But overall the outcome is clear -- read() is always a winner.

"... a winner, below 128kB; above that the difference is within noise and measurement error"?

> It would be interesting to see what difference Nehalem, which has a
> smaller but much faster L2 cache than Core 2. It may perform better
> at larger sizes up to 256Kb.

Interesting.

$ cat FOOTERMessages come from the public archive at lore.kernel.org/git, fetched every hour. The front page is chosen and written each morning by an AI editor and can be wrong; the threads themselves are the record. About and API. For agents: an MCP server at https://gitlist.dev/mcp, and any thread, story or person page as Markdown by adding .md to its URL (or sending Accept: text/markdown). Details in /llms.txt.