On Thursday, 3 May 2018 16:41:55 BST Grant Edwards wrote: > On 2018-05-03, Mick <[email protected]> wrote: > > OK, I know my laptop is quite old, or at least Intel thinks so, but > > emerging > > chromium is now taking *much* longer than it ever did: > A while back I accidentally broke the CPU throttling on my laptop, and > it was always running at 1/4 speed. [That effected all emerges.] I'd > start by doing a "grep MHz /proc/cpuinfo" during the build to verify > that all the CPUs have open throttles. > > That said, I've noticed that Chromium in particular is taking a lot > longer than it used to...
Thank you Peter and Grant for your replies. I have once or twice used a
faster machine to build a Chromium binary and then copied over to the slow
laptop, but it is a bit of a faff. I may have to do this in the future,
although with the landscape changing (GPZ patches, gcc upgrade, etc.) the
build times are changing all the time. They may never reduce again, in which
case it will be an option to consider.
I don't think I have an issue with CPU throttling. i7z shows the CPU with
turbo regularly goes up to 2.6GHz:
=================================
Cpu speed from cpuinfo 1595.00Mhz
cpuinfo might be wrong if cpufreq is enabled. To guess correctly try
estimating via tsc
Linux's inbuilt cpu_khz code emulated now
True Frequency (without accounting Turbo) 1595 MHz
CPU Multiplier 12x || Bus clock frequency (BCLK) 132.92 MHz
Socket [0] - [physical cores=4, logical cores=8, max online cores ever=4]
TURBO ENABLED on 4 Cores, Hyper Threading ON
Max Frequency without considering Turbo 1727.92 MHz (132.92 x [13])
Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is 21x/18x/13x/13x
Real Current Frequency 2244.06 MHz [132.92 x 16.88] (Max of below)
Core [core-id] :Actual Freq (Mult.) C0% Halt(C1)% C3 % C6 %
C7 % Temp VCore
Core 1 [0]: 1454.95 (10.95x) 4.76 11.2 54.6 29.9
0
69 0.0000
Core 2 [1]: 1634.49 (12.30x) 3.09 4.5 52.6 39.7
0
69 0.0000
Core 3 [2]: 2244.06 (16.88x) 99.5 0 0 0
0 72
0.0000
Core 4 [3]: 2235.68 (16.82x) 99.4 0 0 0
0
69 0.0000
C0 = Processor running without halting
C1 = Processor running with halts (States >C0 are power saver modes with cores
idling)
C3 = Cores running with PLL turned off and core cache turned off
C6, C7 = Everything in C3 + core state saved to last level cache, C7 is deeper
than C6
Above values in table are in percentage over the last 1 sec
[core-id] refers to core-id number in /proc/cpuinfo
'Garbage Values' message printed when garbage values are read
=============================================================
/proc/cpuinfo shows a number of cores regularly @1600MHz while syslog does not
report any problems.
--
Regards,
Mick
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