farzonl wrote:
@nikic what is considered a neglible difference in elapsesed time? Elapsed is
consistently a little more after my change in the order of 5-20 seconds.
Examples below:
## Specs
```
processor : 63
vendor_id : AuthenticAMD
cpu family : 25
model : 8
model name : AMD Ryzen Threadripper PRO 5975WX 32-Cores
stepping : 2
microcode : 0xa008205
cpu MHz : 1800.000
cache size : 512 KB
physical id : 0
siblings : 64
core id : 31
cpu cores : 32
```
## Debug build before changes:
```
[5363/5363] Generated
Command being timed: "ninja -C ../llvm_debug_build/"
User time (seconds): 28679.90
System time (seconds): 1482.99
Percent of CPU this job got: 5620%
Elapsed (wall clock) time (h:mm:ss or m:ss): 8:56.62
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 10034904
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 89825
Minor (reclaiming a frame) page faults: 310462049
Voluntary context switches: 1261232
Involuntary context switches: 1125893
Swaps: 0
File system inputs: 37896
File system outputs: 112778048
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
## Release build before changes:
```
ninja: Entering directory `../llvm_release_build/'
[5363/5363] Generated
Command being timed: "ninja -C ../llvm_release_build/"
User time (seconds): 25730.83
System time (seconds): 1238.55
Percent of CPU this job got: 6140%
Elapsed (wall clock) time (h:mm:ss or m:ss): 7:19.22
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 1696776
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 2113
Minor (reclaiming a frame) page faults: 268141745
Voluntary context switches: 551323
Involuntary context switches: 1124237
Swaps: 0
File system inputs: 944
File system outputs: 10928088
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
## Release build after changes:
```
[5365/5365] Generated
Command being timed: "ninja -C ../llvm_release_build/"
User time (seconds): 25542.24
System time (seconds): 1235.53
Percent of CPU this job got: 5852%
Elapsed (wall clock) time (h:mm:ss or m:ss): 7:37.54
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 1695512
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 2075
Minor (reclaiming a frame) page faults: 268176633
Voluntary context switches: 554573
Involuntary context switches: 1113659
Swaps: 0
File system inputs: 264
File system outputs: 11055600
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
## Debug build after changes:
```
[5365/5365] Generated
Command being timed: "ninja -C ../llvm_debug_build/"
User time (seconds): 28477.94
System time (seconds): 1469.80
Percent of CPU this job got: 5523%
Elapsed (wall clock) time (h:mm:ss or m:ss): 9:02.20
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 10817400
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 89172
Minor (reclaiming a frame) page faults: 310414009
Voluntary context switches: 1002199
Involuntary context switches: 1243091
Swaps: 0
File system inputs: 384
File system outputs: 112886080
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
https://github.com/llvm/llvm-project/pull/133619
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