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Message-ID: <82f1bc98-df6d-2b0a-17e5-fa057563284e@gmail.com> Date: Tue, 12 Feb 2019 16:42:04 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Stefano Brivio <sbrivio@...hat.com>, Stephen Hemminger <stephen@...workplumber.org> Cc: netdev@...r.kernel.org, Sabrina Dubroca <sd@...asysnail.net> Subject: Re: [PATCH iproute2 net-next v2 3/4] ss: Buffer raw fields first, then render them as a table On 12/11/2017 04:46 PM, Stefano Brivio wrote: > This allows us to measure the maximum field length for each > column before printing fields and will permit us to apply > optimal field spacing and distribution. Structure of the output > buffer with chunked allocation is described in comments. > > Output is still unchanged, original spacing is used. > > Running over one million sockets with -tul options by simply > modifying main() to loop 50,000 times over the *_show() > functions, buffering the whole output and rendering it at the > end, with 10 UDP sockets, 10 TCP sockets, while throwing > output away, doesn't show significant changes in execution time > on my laptop with an Intel i7-6600U CPU: > > - before this patch: > $ time ./ss -tul > /dev/null > real 0m29.899s > user 0m2.017s > sys 0m27.801s > > - after this patch: > $ time ./ss -tul > /dev/null > real 0m29.827s > user 0m1.942s > sys 0m27.812s > I do not get it. "ss -emoi " uses almost 1KB per socket. 10,000,000 sockets -> we need about 10GB of memory ??? This is a serious regression.
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