Merge #5354
5354: Add opt-in mimalloc feature r=matklad a=ivan
This adds a `mimalloc` feature to use [mimalloc](https://github.com/microsoft/mimalloc) via [mimalloc_rust](https://github.com/purpleprotocol/mimalloc_rust), and a corresponding `cargo xtask install --server --mimalloc`.
In my tests on Linux, mimalloc seems to run consistently faster than jemalloc and uses only slightly more memory in `analysis-stats` on chalk. Also, builds with mimalloc produce a binary 3MB smaller than builds with jemalloc.
A summary of `env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/` runs on NixOS master on an Intel 4790K in VMware Workstation:
<table>
<tr>
<td></td><td>self-reported time</td><td>elapsed time</td><td>max RSS</td>
</tr>
<tr><td>glibc 2.30 run 1</td><td>225.1 sec</td><td>3:46.91</td><td>1075208</td></tr>
<tr><td>glibc 2.30 run 2</td><td>228.4 sec</td><td>3:50.13</td><td>1074996</td></tr>
<tr><td>jemalloc run 1</td><td>201.8 sec</td><td>3:23.03</td><td>1055960</td></tr>
<tr><td>jemalloc run 2</td><td>199.2 sec</td><td>3:20.41</td><td>1065040</td></tr>
<tr><td>mimalloc run 1</td><td>188.6 sec</td><td>3:09.77</td><td>1105584</td></tr>
<tr><td>mimalloc run 2</td><td>185.0 sec</td><td>3:06.23</td><td>1108132</td></tr>
<tr><td>mimalloc + lto run 1</td><td>160.7 sec</td><td>2:41.80</td><td>1106076</td></tr>
<tr><td>mimalloc + lto run 2</td><td>162.2 sec</td><td>2:43.31</td><td>1104268</td></tr>
</tr>
</table>
I included an `lto = true; codegen-units = 1` run out of curiosity, this PR doesn't enable it.
<details>
<summary>analysis-stats benchmark runs</summary>
## default
```
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.10s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 333.880345ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 10.176299461s, 0b allocated 0b resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 214.968806927s, 0b allocated 0b resident
Total: 225.145114417s, 0b allocated 0b resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 225.34
System time (seconds): 1.49
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 3:46.91
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): 1075208
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 6
Minor (reclaiming a frame) page faults: 294711
Voluntary context switches: 365
Involuntary context switches: 3273
Swaps: 0
File system inputs: 2904
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.10s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 332.711598ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 9.895020518s, 0b allocated 0b resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 218.5001697s, 0b allocated 0b resident
Total: 228.39519833s, 0b allocated 0b resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 228.26
System time (seconds): 1.75
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 3:50.13
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): 1074996
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 9
Minor (reclaiming a frame) page faults: 294748
Voluntary context switches: 330
Involuntary context switches: 1561
Swaps: 0
File system inputs: 12608
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
## jemalloc
```
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.11s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 356.090374ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 10.176550183s, 439mb allocated 465mb resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 191.607201827s, 993mb allocated 1036mb resident
Total: 201.783937913s, 993mb allocated 1036mb resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 201.07
System time (seconds): 1.89
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 3:23.03
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): 1055960
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 357755
Voluntary context switches: 240
Involuntary context switches: 1889
Swaps: 0
File system inputs: 256
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.10s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 317.917622ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 9.902142185s, 439mb allocated 463mb resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 189.295317017s, 993mb allocated 1046mb resident
Total: 199.197555943s, 993mb allocated 1046mb resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 198.64
System time (seconds): 1.67
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 3:20.41
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): 1065040
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 369013
Voluntary context switches: 243
Involuntary context switches: 2835
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
## mimalloc
```
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.12s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 332.116806ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 9.796643695s, 0b allocated 0b resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 178.82132362s, 0b allocated 0b resident
Total: 188.617975605s, 0b allocated 0b resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 187.70
System time (seconds): 1.97
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 3:09.77
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): 1105584
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 296481
Voluntary context switches: 222
Involuntary context switches: 1868
Swaps: 0
File system inputs: 256
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.13s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 320.046776ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 9.287690124s, 0b allocated 0b resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 175.710939697s, 0b allocated 0b resident
Total: 184.998640033s, 0b allocated 0b resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 184.38
System time (seconds): 1.81
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 3:06.23
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): 1108132
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 297055
Voluntary context switches: 374
Involuntary context switches: 2374
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
## mimalloc + lto
```
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.11s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 369.600196ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 7.572726834s, 0b allocated 0b resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 153.090899101s, 0b allocated 0b resident
Total: 160.663635235s, 0b allocated 0b resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 160.01
System time (seconds): 1.70
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 2:41.80
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): 1106076
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 1
Minor (reclaiming a frame) page faults: 296610
Voluntary context switches: 209
Involuntary context switches: 2798
Swaps: 0
File system inputs: 8
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
# env time -v cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
Finished release [optimized] target(s) in 0.10s
Running `target/release/rust-analyzer analysis-stats ../chalk/`
[ERROR ra_project_model] cyclic dependency chalk-integration -> chalk-engine
[ERROR ra_project_model] cyclic dependency chalk-recursive -> chalk-integration
[ERROR ra_project_model] cyclic dependency chalk-solve -> chalk-integration
Database loaded 334.630658ms
Crates in this dir: 11
Total modules found: 159
Total declarations: 2631
Total functions: 1947
Item Collection: 7.71699197s, 0b allocated 0b resident
Total expressions: 57094
Expressions of unknown type: 2938 (5%)
Expressions of partially unknown type: 2427 (4%)
Type mismatches: 232
Inference: 154.50351318s, 0b allocated 0b resident
Total: 162.220513775s, 0b allocated 0b resident
Command being timed: "cargo run --release -p rust-analyzer -- analysis-stats ../chalk/"
User time (seconds): 161.52
System time (seconds): 1.74
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 2:43.31
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): 1104268
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 296183
Voluntary context switches: 200
Involuntary context switches: 1666
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
```
</details>
Co-authored-by: Ivan Kozik <ivan@ludios.org>
b8b41c5f41