[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Emacs benchmark workload to run and time instead of hunch performanc
From: |
Emanuel Berg |
Subject: |
Re: Emacs benchmark workload to run and time instead of hunch performance |
Date: |
Wed, 09 Jul 2014 01:30:24 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
Emanuel Berg <embe8573@student.uu.se> did write:
> What I can see from looking a the screenshot and
> skimming the README.md this measures Emacs startup
> time (esup) - but if you read my post, I said there
> is no reason (for me at least) to do that, as I have
> the OS automatically start Emacs after booting, so
> for me it is part of the boot process. After that I
> never close Emacs until I'm done for the time being,
> closing Emacs as well as shutting down the
> computer. And that is the recommended usage. It can
> of course be interesting to measure startup time but
> for my practical situation it wouldn't hurt (really)
> if Emacs took 10 minutes to start! No, I asked for
> some benchmark workload to run that would emulate or
> to a degree actually perform what could be considered
> normal emaxing - that way, the exact same workload
> could be run with and without (emacs -Q) extensive
> configuration and the require and load of modules,
> and then the times could be compared. In C, there is
> a way of hammering the DRAM and the memory bus (both
> of which might be shared on a multiprocessor
> architecture) with memory accesses that will crash
> through the core-local caches: it is called pointer
> chasing and is basically creating lots of pointers
> and then assigning values and dereferencing the
> pointers... Pretty simple and effective. Because
> Emacs is much more complicated, the method perhaps
> must be, too (?); but actually any Elisp could be
> executed and timed this way to give some estimate.
It is as I feared. Blinded by success, the bright side
has grown complacent, allowing the dark side to regroup
unhindered. Only the super-senses of the
sleep-and-food-deprived Jedi Knights alerted us to this
grave danger!
Not-very-ambitious workload but still:
(defun bench ()
(interactive)
(define-abbrev global-abbrev-table "rsb" "rec.sport.boxing")
(insert "rsb")
(expand-abbrev)
(insert " 3")
(backward-char 3)
(delete-char 2)
(buffer-menu)
(man "ls")
(beginning-of-buffer) )
(progn
(elp-instrument-function 'bench)
(bench)
(elp-results) )
Execution times for first invocation:
emacs -Q:
bench 1 0.038667778 0.038667778
emacs, with tons of configuration:
bench 1 0.05604648 0.05604648
Keep calling it I guess it ends up in a cache because
it gets much faster - but the emacs -Q is still faster.
So the next question is just what configs slows it down
- if there is indeed a difference there...
--
underground experts united