linux-kernel - Re: [PATCH 0/1] vsprintf: optimize decimal conversion (again)

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Message-ID: <4F73F1E0.7080803@gmail.com>
Date:	Thu, 29 Mar 2012 08:23:44 +0300
From:	roma1390 <roma1390@...il.com>
To:	Denys Vlasenko <vda.linux@...glemail.com>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Douglas W Jones <jones@...uiowa.edu>,
	Michal Nazarewicz <mnazarewicz@...gle.com>
Subject: Re: [PATCH 0/1] vsprintf: optimize decimal conversion (again)

On 2012.03.28 14:23, Denys Vlasenko wrote:
> It looks ok - it is a bit faster that original code;
> but I expect algorithm #2 will do better.
>
> BTW, please always run test of original code too when you measure speed,
> and post both results.

And the test results are:

./test_new-org-with-noinline_for_stack
Conversions per second: 8:5188000 123:4340000 123456:3536000 12345678:3164000 
123456789:2036000 2^32:2032000 2^64:1544000
Conversions per second: 8:5016000 123:4320000 123456:3536000 12345678:3272000 
123456789:2032000 2^32:1964000 2^64:1540000
Conversions per second: 8:5192000 123:4336000 123456:3420000 12345678:3268000 
123456789:2036000 2^32:2032000 2^64:1544000
Conversions per second: 8:5164000 123:4336000 123456:3536000 12345678:3272000 
123456789:1968000 2^32:2032000 2^64:1544000
Tested 524288                               ^C

# ./test_new-org-with-noinline_for_stack_if-LONG_MAX_header_arm
Conversions per second: 8:5020000 123:4332000 123456:3536000 12345678:3272000 
123456789:2828000 2^32:2260000 2^64:1536000
Conversions per second: 8:5192000 123:4332000 123456:3416000 12345678:3252000 
123456789:2828000 2^32:2336000 2^64:1540000
Conversions per second: 8:5172000 123:4336000 123456:3540000 12345678:3272000 
123456789:2736000 2^32:2336000 2^64:1536000
Conversions per second: 8:5192000 123:4192000 123456:3520000 12345678:3276000 
123456789:2828000 2^32:2340000 2^64:1484000
Tested 524288                               ^C


roma1390
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