TPPPP72 wrote:
About performance, here is a more detailed stat by perf.
```
Performance counter stats for './llvm-project/llvm/build/bin/clang-old -c
./sqlite-amalgamation-3530000/sqlite3.c -O2' (10 runs):
0 context-switches:u # 0.0 cs/sec
cs_per_second
0 cpu-migrations:u # 0.0
migrations/sec migrations_per_second
27,528 page-faults:u # 2865.5 faults/sec
page_faults_per_second ( +- 0.38% )
9,606.77 msec task-clock:u # 1.0 CPUs
CPUs_utilized ( +- 1.55% )
562,436,942 cpu_core/branch-misses/u # 3.9 %
branch_miss_rate ( +- 0.03% ) (99.96%)
14,242,893,477 cpu_core/branches/u # 1482.6 M/sec
branch_frequency ( +- 0.02% ) (99.96%)
48,115,577,715 cpu_core/cpu-cycles/u # 5.0 GHz
cycles_frequency ( +- 0.08% ) (99.96%)
70,229,686,496 cpu_core/instructions/u # 1.5
instructions insn_per_cycle ( +- 0.01% ) (99.96%)
176,824,886 cpu_atom/branch-misses/u # 4.7 %
branch_miss_rate ( +- 22.20% ) (0.01%)
4,313,383,905 cpu_atom/branches/u # 449.0 M/sec
branch_frequency ( +- 10.66% ) (0.02%)
18,726,124,144 cpu_atom/cpu-cycles/u # 1.9 GHz
cycles_frequency ( +- 10.69% ) (0.03%)
24,326,736,954 cpu_atom/instructions/u # 1.4
instructions insn_per_cycle ( +- 13.70% ) (0.04%)
TopdownL1 (cpu_core) # 19.5 %
tma_bad_speculation
# 47.7 %
tma_frontend_bound ( +- 0.08% ) (99.96%)
# 11.3 %
tma_backend_bound
# 21.5 %
tma_retiring ( +- 0.45% ) (99.96%)
TopdownL1 (cpu_atom) # 17.7 %
tma_backend_bound ( +- 13.73% ) (0.02%)
# 28.0 %
tma_frontend_bound ( +- 31.00% ) (0.01%)
# 32.2 %
tma_bad_speculation
# 22.0 %
tma_retiring ( +- 25.02% ) (0.00%)
9.643525438 +- 0.153565741 seconds time elapsed ( +- 1.59% )
```
```
Performance counter stats for './llvm-project/llvm/build/bin/clang-new -c
./sqlite-amalgamation-3530000/sqlite3.c -O2' (10 runs):
0 context-switches:u # 0.0 cs/sec
cs_per_second
0 cpu-migrations:u # 0.0
migrations/sec migrations_per_second
27,638 page-faults:u # 2919.5 faults/sec
page_faults_per_second ( +- 0.33% )
9,466.54 msec task-clock:u # 1.0 CPUs
CPUs_utilized ( +- 0.22% )
562,493,857 cpu_core/branch-misses/u # 3.9 %
branch_miss_rate ( +- 0.04% ) (99.87%)
14,241,878,713 cpu_core/branches/u # 1504.4 M/sec
branch_frequency ( +- 0.03% ) (99.87%)
48,159,908,379 cpu_core/cpu-cycles/u # 5.1 GHz
cycles_frequency ( +- 0.05% ) (99.87%)
70,226,877,731 cpu_core/instructions/u # 1.5
instructions insn_per_cycle ( +- 0.03% ) (99.87%)
181,991,870 cpu_atom/branch-misses/u # 5.1 %
branch_miss_rate ( +- 28.05% ) (0.06%)
3,626,230,812 cpu_atom/branches/u # 383.1 M/sec
branch_frequency ( +- 21.37% ) (0.07%)
16,519,601,555 cpu_atom/cpu-cycles/u # 1.7 GHz
cycles_frequency ( +- 18.12% ) (0.08%)
20,566,965,998 cpu_atom/instructions/u # 1.3
instructions insn_per_cycle ( +- 20.87% ) (0.08%)
TopdownL1 (cpu_core) # 19.3 %
tma_bad_speculation
# 47.7 %
tma_frontend_bound ( +- 0.04% ) (99.87%)
# 11.4 %
tma_backend_bound
# 21.5 %
tma_retiring ( +- 0.45% ) (99.87%)
TopdownL1 (cpu_atom) # 21.6 %
tma_backend_bound ( +- 18.33% ) (0.07%)
# 27.5 %
tma_frontend_bound ( +- 34.40% ) (0.06%)
# 22.8 %
tma_bad_speculation
# 28.1 %
tma_retiring ( +- 27.53% ) (0.06%)
9.522733738 +- 0.018644996 seconds time elapsed ( +- 0.20% )
```
```
Performance counter stats for './llvm-project/llvm/build/bin/clang-old -c
stress.cpp -O2' (10 runs):
0 context-switches:u # 0.0 cs/sec
cs_per_second
0 cpu-migrations:u # 0.0
migrations/sec migrations_per_second
23,246 page-faults:u # 10013.3 faults/sec
page_faults_per_second ( +- 0.65% )
2,321.50 msec task-clock:u # 1.0 CPUs
CPUs_utilized ( +- 2.55% )
97,945,687 cpu_core/branch-misses/u # 3.0 %
branch_miss_rate ( +- 2.53% ) (99.38%)
3,219,170,623 cpu_core/branches/u # 1386.7 M/sec
branch_frequency ( +- 0.25% ) (99.38%)
10,528,818,041 cpu_core/cpu-cycles/u # 4.5 GHz
cycles_frequency ( +- 0.79% ) (99.38%)
15,815,922,416 cpu_core/instructions/u # 1.5
instructions insn_per_cycle ( +- 0.31% ) (99.38%)
22,314,671 cpu_atom/branch-misses/u # 3.2 %
branch_miss_rate ( +- 16.90% ) (0.24%)
859,514,215 cpu_atom/branches/u # 370.2 M/sec
branch_frequency ( +- 12.64% ) (0.29%)
5,003,111,548 cpu_atom/cpu-cycles/u # 2.2 GHz
cycles_frequency ( +- 15.29% ) (0.33%)
4,120,474,954 cpu_atom/instructions/u # 0.9
instructions insn_per_cycle ( +- 13.04% ) (0.37%)
TopdownL1 (cpu_core) # 14.0 %
tma_bad_speculation
# 55.6 %
tma_frontend_bound ( +- 0.78% ) (99.38%)
# 7.2 %
tma_backend_bound
# 23.2 %
tma_retiring ( +- 0.37% ) (99.38%)
TopdownL1 (cpu_atom) # 14.9 %
tma_backend_bound ( +- 26.08% ) (0.37%)
# 50.8 %
tma_frontend_bound ( +- 26.25% ) (0.33%)
# 19.7 %
tma_bad_speculation
# 14.6 %
tma_retiring ( +- 22.51% ) (0.29%)
2.333430540 +- 0.057612709 seconds time elapsed ( +- 2.47% )
```
```
Performance counter stats for './llvm-project/llvm/build/bin/clang-new -c
stress.cpp -O2' (10 runs):
0 context-switches:u # 0.0 cs/sec
cs_per_second
0 cpu-migrations:u # 0.0
migrations/sec migrations_per_second
23,244 page-faults:u # 11015.4 faults/sec
page_faults_per_second ( +- 0.47% )
2,110.14 msec task-clock:u # 1.0 CPUs
CPUs_utilized ( +- 2.07% )
94,553,192 cpu_core/branch-misses/u # 2.9 %
branch_miss_rate ( +- 2.30% ) (99.65%)
3,237,416,012 cpu_core/branches/u # 1534.2 M/sec
branch_frequency ( +- 0.18% ) (99.65%)
10,496,790,298 cpu_core/cpu-cycles/u # 5.0 GHz
cycles_frequency ( +- 0.67% ) (99.65%)
15,931,380,010 cpu_core/instructions/u # 1.5
instructions insn_per_cycle ( +- 0.22% ) (99.65%)
24,725,930 cpu_atom/branch-misses/u # 2.7 %
branch_miss_rate ( +- 12.02% ) (0.11%)
846,215,165 cpu_atom/branches/u # 401.0 M/sec
branch_frequency ( +- 12.09% ) (0.11%)
4,854,560,640 cpu_atom/cpu-cycles/u # 2.3 GHz
cycles_frequency ( +- 13.34% ) (0.11%)
3,901,951,512 cpu_atom/instructions/u # 0.8
instructions insn_per_cycle ( +- 11.77% ) (0.16%)
TopdownL1 (cpu_core) # 13.7 %
tma_bad_speculation
# 55.7 %
tma_frontend_bound ( +- 0.67% ) (99.65%)
# 7.4 %
tma_backend_bound
# 23.2 %
tma_retiring ( +- 0.51% ) (99.65%)
TopdownL1 (cpu_atom) # 11.5 %
tma_backend_bound ( +- 21.51% ) (0.29%)
# 53.7 %
tma_frontend_bound ( +- 21.85% ) (0.25%)
# 17.8 %
tma_bad_speculation
# 17.0 %
tma_retiring ( +- 16.86% ) (0.20%)
2.130017112 +- 0.052655206 seconds time elapsed ( +- 2.47% )
```
https://github.com/llvm/llvm-project/pull/192080
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