Re: Stealing a Great Idea from the 6600

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Sujet : Re: Stealing a Great Idea from the 6600
De : cr88192 (at) *nospam* gmail.com (BGB)
Groupes : comp.arch
Date : 28. Apr 2024, 09:59:28
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v0l35j$v8sl$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
User-Agent : Mozilla Thunderbird
On 4/28/2024 2:11 AM, BGB wrote:
On 4/28/2024 12:56 AM, BGB wrote:
On 4/27/2024 8:45 PM, MitchAlsup1 wrote:
BGB wrote:
>
 ...
 
>
I guess some people are dragging their feet on FDPIC, as there is some debate as to whether or not NOMMU makes sense for RISC-V, along with its associated performance impact if used.
>
In my case, if I wanted to go over to simple base-relocatable images, this would technically eliminate the need for GBR reloading.
>
Checks:
Simple base-relocatable case actually currently generates bigger binaries, I suspect because in this case it is less space-efficient to use PC-rel vs GBR-rel.
>
Went and added a "pbostatic" option, which sidesteps saving and restoring GBR (making the simplifying assumption that functions will never be called from outside the current binary).
>
This saves roughly 4K (Doom's ".text" shrinks to 280K).
>
Would you be willing to compile DOOM with Brian's LLVM compiler and
show the results ??
>
>
Will need to download and build this compiler...
>
Might need to look into this.
>
Please do.
>
>
Extracting the ZIP file and "git clone llvm-project" etc, have thus far taken hours...
>
Well, and then the commands to CMake were not working, tried invoking cmake more minimally, and it gives a message complaining about the version being too old, ...
>
Seems I have to build it with a different / newer WSL instance (well, I guess it was either this or try to rebuild CMake from source).
>
>
Checks, download for compiler (+ git cloned LLVM) is a little over 6GB.
>
>
Well, OK, now LLVM is building... I guess, will see if it compiles and doesn't explode in the process. Probably going to be a while it seems.
>
   A little over an hour later and it still hasn't broken 50% yet...
 I think LLVM rebuilds may have actually gotten slower than in the past...
  Well, at least my 112GB of RAM means it isn't swapping too much...
 Computer is a little sluggish and the "System" process seems kinda pegged out though...
   I guess I will know sometime later whether or not all of this builds...
 
Still watching LLVM build (several hours later), kinda of an interesting meta aspect in its behaviors.
Sub-stage 1:
cc1plus processes, they start out mostly idle, sit around idle for a few seconds, CPU activity spikes and then they terminate (and a new one spawns to take its place).
During this sub-process, PC is generally sluggish.
Sub-stage 2:
"llvm-tblgen" runs; these processes are short lived and run at high CPU load; but PC stops being sluggish for the brief moments it is running these (but, soon enough, it is back to the former stage).
Overall CPU load is fairly modest, and HDD activity is also fairly reasonable. Seems like there is a bottleneck that "cc1plus" steps on.
The "System" process runs at somewhat higher than usual CPU load (~ 8%), process description "NT Kernel & System", where spikes in this process seem correlated with the "general sluggishness".
Seems likely related to the "teh crapton" of files it contained...
Also does not escape my notice that on the build drive in question, it has seemingly eaten over 100GB of disk space during the build project...
Like, seemingly, LLVM has managed to somehow become more absurd than it was in the past...
Dunno, maybe all this seems like pretty reasonable project design to some people, but at least to me, it all seems a little absurd.
Well, unless some people experience it building quickly and not eating huge amounts of HDD space.
Dunno, maybe related to me running the build on a drive with "Folder Compression" enabled?... (Often times, folder compression makes things faster, but this might be one of the times where it doesn't).
Some of this is kind of a disincentive to trying to build a compiler based on LLVM though. Trying to have this as a normal part of the build process seems implausible.
Like, if it makes Vivado synthesis and implementation seem fast and lightweight in comparison, this is not an ideal situation...
GCC is an ugly mess, but at least it builds moderately faster.
...

Date Sujet#  Auteur
17 Apr 24 * Stealing a Great Idea from the 6600128John Savard
18 Apr 24 +* Re: Stealing a Great Idea from the 6600125MitchAlsup1
18 Apr 24 i`* Re: Stealing a Great Idea from the 6600124John Savard
18 Apr 24 i `* Re: Stealing a Great Idea from the 6600123MitchAlsup1
19 Apr 24 i  `* Re: Stealing a Great Idea from the 6600122John Savard
19 Apr 24 i   `* Re: Stealing a Great Idea from the 6600121John Savard
19 Apr 24 i    `* Re: Stealing a Great Idea from the 6600120MitchAlsup1
20 Apr 24 i     +* Re: Stealing a Great Idea from the 66002John Savard
21 Apr 24 i     i`- Re: Stealing a Great Idea from the 66001John Savard
20 Apr 24 i     `* Re: Stealing a Great Idea from the 6600117John Savard
20 Apr 24 i      `* Re: Stealing a Great Idea from the 6600116John Savard
20 Apr 24 i       `* Re: Stealing a Great Idea from the 6600115MitchAlsup1
20 Apr 24 i        +* Re: Stealing a Great Idea from the 6600105BGB
21 Apr 24 i        i`* Re: Stealing a Great Idea from the 6600104MitchAlsup1
21 Apr 24 i        i +* Re: Stealing a Great Idea from the 660063John Savard
21 Apr 24 i        i i+* Re: Stealing a Great Idea from the 660015John Savard
25 Apr 24 i        i ii`* Re: Stealing a Great Idea from the 660014Lawrence D'Oliveiro
25 Apr 24 i        i ii +* Re: Stealing a Great Idea from the 660012MitchAlsup1
25 Apr 24 i        i ii i+- Re: Stealing a Great Idea from the 66001Lawrence D'Oliveiro
30 Apr 24 i        i ii i`* Re: a bit of history, Stealing a Great Idea from the 660010John Levine
3 May 24 i        i ii i `* Re: a bit of history, Stealing a Great Idea from the 66009Anton Ertl
3 May 24 i        i ii i  +* Re: a bit of history, Stealing a Great Idea from the 66007John Levine
4 May 24 i        i ii i  i`* Re: a bit of history, Stealing a Great Idea from the 66006Thomas Koenig
4 May 24 i        i ii i  i +* Re: a bit of history, Stealing a Great Idea from the 66004John Levine
4 May 24 i        i ii i  i i`* Re: a bit of history, Stealing a Great Idea from the 66003MitchAlsup1
5 May 24 i        i ii i  i i `* Re: a bit of history, Stealing a Great Idea from the 66002Thomas Koenig
5 May 24 i        i ii i  i i  `- Re: a bit of history, Stealing a Great Idea from the 66001MitchAlsup1
28 Jul 24 i        i ii i  i `- Re: a bit of history, Stealing a Great Idea from the 66001Lawrence D'Oliveiro
3 May 24 i        i ii i  `- Re: a bit of history, Stealing a Great Idea from the 66001MitchAlsup1
25 Apr 24 i        i ii `- Re: Stealing a Great Idea from the 66001John Savard
21 Apr 24 i        i i`* Re: Stealing a Great Idea from the 660047MitchAlsup1
23 Apr 24 i        i i +* Re: Stealing a Great Idea from the 660045George Neuner
23 Apr 24 i        i i i`* Re: Stealing a Great Idea from the 660044MitchAlsup1
25 Apr 24 i        i i i `* Re: Stealing a Great Idea from the 660043George Neuner
26 Apr 24 i        i i i  `* Re: Stealing a Great Idea from the 660042BGB
26 Apr 24 i        i i i   `* Re: Stealing a Great Idea from the 660041MitchAlsup1
26 Apr 24 i        i i i    +* Re: Stealing a Great Idea from the 66002Anton Ertl
26 Apr 24 i        i i i    i`- Re: Stealing a Great Idea from the 66001MitchAlsup1
26 Apr 24 i        i i i    +* Re: Stealing a Great Idea from the 66004BGB
26 Apr 24 i        i i i    i+* Re: Stealing a Great Idea from the 66002MitchAlsup1
27 Apr 24 i        i i i    ii`- Re: Stealing a Great Idea from the 66001BGB
26 Apr 24 i        i i i    i`- Re: Stealing a Great Idea from the 66001MitchAlsup1
27 Apr 24 i        i i i    `* Re: Stealing a Great Idea from the 660034BGB
27 Apr 24 i        i i i     `* Re: Stealing a Great Idea from the 660033MitchAlsup1
28 Apr 24 i        i i i      `* Re: Stealing a Great Idea from the 660032BGB
28 Apr 24 i        i i i       `* Re: Stealing a Great Idea from the 660031MitchAlsup1
28 Apr 24 i        i i i        `* Re: Stealing a Great Idea from the 660030BGB
28 Apr 24 i        i i i         +* Re: Stealing a Great Idea from the 660024BGB
28 Apr 24 i        i i i         i`* Re: Stealing a Great Idea from the 660023BGB
28 Apr 24 i        i i i         i `* Re: Stealing a Great Idea from the 660022Thomas Koenig
28 Apr 24 i        i i i         i  `* Re: Stealing a Great Idea from the 660021BGB
28 Apr 24 i        i i i         i   `* Re: Stealing a Great Idea from the 660020BGB
28 Apr 24 i        i i i         i    +* Re: Stealing a Great Idea from the 66002Thomas Koenig
28 Apr 24 i        i i i         i    i`- Re: Stealing a Great Idea from the 66001BGB
29 Jul 24 i        i i i         i    +* Re: Stealing a Great Idea from the 660016Lawrence D'Oliveiro
29 Jul 24 i        i i i         i    i+* Re: Stealing a Great Idea from the 66006BGB
30 Jul 24 i        i i i         i    ii`* Re: Stealing a Great Idea from the 66005Lawrence D'Oliveiro
30 Jul 24 i        i i i         i    ii `* Re: Stealing a Great Idea from the 66004BGB
31 Jul 24 i        i i i         i    ii  `* Re: Stealing a Great Idea from the 66003Lawrence D'Oliveiro
31 Jul 24 i        i i i         i    ii   `* Re: Stealing a Great Idea from the 66002BGB
1 Aug 24 i        i i i         i    ii    `- Re: Stealing a Great Idea from the 66001Lawrence D'Oliveiro
29 Jul 24 i        i i i         i    i`* Re: Stealing a Great Idea from the 66009Terje Mathisen
29 Jul 24 i        i i i         i    i `* Re: Stealing a Great Idea from the 66008MitchAlsup1
30 Jul 24 i        i i i         i    i  +- Re: Stealing a Great Idea from the 66001Lawrence D'Oliveiro
30 Jul 24 i        i i i         i    i  +* Re: Stealing a Great Idea from the 66004Michael S
30 Jul 24 i        i i i         i    i  i`* Re: Stealing a Great Idea from the 66003MitchAlsup1
31 Jul 24 i        i i i         i    i  i `* Re: Stealing a Great Idea from the 66002BGB
1 Aug 24 i        i i i         i    i  i  `- Re: Stealing a Great Idea from the 66001Lawrence D'Oliveiro
1 Aug 24 i        i i i         i    i  `* Re: Stealing a Great Idea from the 66002Thomas Koenig
1 Aug 24 i        i i i         i    i   `- Re: Stealing a Great Idea from the 66001MitchAlsup1
29 Jul 24 i        i i i         i    `- Re: Stealing a Great Idea from the 66001George Neuner
28 Apr 24 i        i i i         `* Re: Stealing a Great Idea from the 66005MitchAlsup1
28 Apr 24 i        i i i          `* Re: Stealing a Great Idea from the 66004BGB
29 Apr 24 i        i i i           `* Re: Stealing a Great Idea from the 66003MitchAlsup1
29 Apr 24 i        i i i            `* Re: Stealing a Great Idea from the 66002BGB
29 Apr 24 i        i i i             `- Re: Stealing a Great Idea from the 66001Thomas Koenig
29 Apr 24 i        i i `- Re: Stealing a Great Idea from the 66001Tim Rentsch
21 Apr 24 i        i `* Re: Stealing a Great Idea from the 660040BGB
21 Apr 24 i        i  `* Re: Stealing a Great Idea from the 660039MitchAlsup1
22 Apr 24 i        i   +* Re: Stealing a Great Idea from the 66003BGB
22 Apr 24 i        i   i`* Re: Stealing a Great Idea from the 66002MitchAlsup1
22 Apr 24 i        i   i `- Re: Stealing a Great Idea from the 66001BGB
22 Apr 24 i        i   +* Re: Stealing a Great Idea from the 66002John Savard
22 Apr 24 i        i   i`- Re: Stealing a Great Idea from the 66001BGB
22 Apr 24 i        i   `* Re: Stealing a Great Idea from the 660033Terje Mathisen
22 Apr 24 i        i    +- Re: Stealing a Great Idea from the 66001BGB
13 Jun 24 i        i    `* Re: Stealing a Great Idea from the 660031Kent Dickey
13 Jun 24 i        i     +* Re: Stealing a Great Idea from the 660016Stefan Monnier
13 Jun 24 i        i     i`* Re: Stealing a Great Idea from the 660015BGB
13 Jun 24 i        i     i `* Re: Stealing a Great Idea from the 660014MitchAlsup1
14 Jun 24 i        i     i  `* Re: Stealing a Great Idea from the 660013BGB
18 Jun 24 i        i     i   `* Re: Stealing a Great Idea from the 660012MitchAlsup1
19 Jun 24 i        i     i    +* Re: Stealing a Great Idea from the 66008BGB
19 Jun 24 i        i     i    i`* Re: Stealing a Great Idea from the 66007MitchAlsup1
19 Jun 24 i        i     i    i +* Re: Stealing a Great Idea from the 66005BGB
19 Jun 24 i        i     i    i i`* Re: Stealing a Great Idea from the 66004MitchAlsup1
20 Jun 24 i        i     i    i i `* Re: Stealing a Great Idea from the 66003Thomas Koenig
20 Jun 24 i        i     i    i i  `* Re: Stealing a Great Idea from the 66002MitchAlsup1
21 Jun 24 i        i     i    i i   `- Re: Stealing a Great Idea from the 66001Thomas Koenig
20 Jun 24 i        i     i    i `- Re: Stealing a Great Idea from the 66001John Savard
19 Jun 24 i        i     i    +- Re: Stealing a Great Idea from the 66001Thomas Koenig
20 Jun 24 i        i     i    +- Re: Stealing a Great Idea from the 66001MitchAlsup1
31 Jul 24 i        i     i    `- Re: Stealing a Great Idea from the 66001Lawrence D'Oliveiro
13 Jun 24 i        i     +* Re: Stealing a Great Idea from the 660013MitchAlsup1
14 Jun 24 i        i     `- Re: Stealing a Great Idea from the 66001Terje Mathisen
22 Apr 24 i        `* Re: Stealing a Great Idea from the 66009John Savard
18 Apr 24 `* Re: Stealing a Great Idea from the 66002Lawrence D'Oliveiro

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