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Comments for Brendan's blog

Brendan Gregg's professional blog

Last Build Date: Tue, 25 Mar 2014 02:37:57 +0000


Comment on A New Challenge by Jan Matis

Tue, 25 Mar 2014 02:37:57 +0000

Clearly not enough people said this. Congratulations, best luck with new stuff and thanks for all the fish. :)

Comment on A New Challenge by tim kennedy

Fri, 21 Mar 2014 00:21:06 +0000

Best of luck at your new opportunity, Brendan. Thank you for everything you've contributed to system engineering profession. We will remain grateful. Cheers.

Comment on A New Challenge by Ugo

Mon, 17 Mar 2014 14:38:20 +0000

Good luck Brendan, thanks for everything, but please wait a little bit before publishing a new book 'cause I still have to finish the last one ;-)

Comment on A New Challenge by Kebabbert

Sun, 09 Mar 2014 21:23:09 +0000

Good luck on your new endeavours, and thanx for your contributions! :)

Comment on Another 10 Performance Wins by Jervin R

Fri, 14 Feb 2014 04:44:16 +0000

Brendan, The Perfona test is interesting. At one point, hitting a single row from multiple threads will surely lead to contention because of row locks (if its InnoDB). However, I wonder if its 16x improvement on the same Joyent instance or against an AWS instance? What was the performance difference between Joyent and AWS on the same test?

Comment on Systems Performance: available now by Harry J Foxwell

Wed, 06 Nov 2013 16:14:47 +0000

Comment on Control T for TENEX by Raghavendra

Sun, 13 Oct 2013 23:38:44 +0000

I have known about Ctrl-T for a while (while I was managing FreeBSD servers) but then lost touch of it (since Linux doesn't have it), it is quite nifty to have. It shouldn't be that hard to include it in linux kernel, I wonder why it hasn't been added yet; should require some code additions to tty driver.

Comment on The TSA Method by Brendan's blog » The USE Method

Fri, 11 Oct 2013 22:43:13 +0000

[...] Also see the complementary thread-based methodology, the TSA Method. [...]

Comment on Control T for TENEX by Bill Sommerfeld

Sat, 05 Oct 2013 18:42:21 +0000

The common element for control-T: DEC. I first bumped into it on RSTS-E in the early-80's (high school, '80-'84) and again on TOPS-20 (college, '84-'88). A 1985 RSTS/E manual mentions it on pdf page 19: A few machines at MIT were running hacks that implemented it in BSD in the '84+ timeframe - useful on a timesharing system to figure out if it's just your job looping or if the machine is just overloaded. Multics definitely didn't have it - it tried to offload as much character-at-a-time processing onto front-end I/O processors so the main CPU wouldn't need to take an interrupt until it had a full command line. Some discussion of the Multics terminal I/O structure here:

Comment on Control T for TENEX by bh

Sat, 05 Oct 2013 17:05:19 +0000

ctrl-t was always in (Open)VMS, and as VMS was a successor of sorts to TOPS I wouldn't be surprised if it was in TOPS to begin with.