| 24 May 2025 |
 Randy Eckenrode | Only 1%? | 17:59:21 |
 Tristan Ross | Would be hard to say if that's truly the performance impact | 18:00:28 |
| Tristan Ross | Best thing is to compare the variants stdenv with the cross stdenv that matches along and see how the evaluation compares. | 18:00:58 |
| 25 May 2025 |
| Tristan Ross | So I have a comparison between pkgsMusl.stdenv and crossStdenv.configs.aarch64-unknown-linux-musl | 01:37:56 |
| Tristan Ross | crossStdenv.configs.aarch64-unknown-linux-musl
{
"cpuTime": 0.43762001395225525,
"envs": {
"bytes": 5428488,
"elements": 369695,
"number": 308866
},
"gc": {
"cycles": 1,
"heapSize": 402915328,
"totalBytes": 79396896
},
"list": {
"bytes": 717400,
"concats": 4609,
"elements": 89675
},
"nrAvoided": 294217,
"nrExprs": 135112,
"nrFunctionCalls": 295668,
"nrLookups": 152167,
"nrOpUpdateValuesCopied": 2227726,
"nrOpUpdates": 12343,
"nrPrimOpCalls": 114176,
"nrThunks": 263414,
"sets": {
"bytes": 42449136,
"elements": 2626304,
"number": 26767
},
"sizes": {
"Attr": 16,
"Bindings": 16,
"Env": 8,
"Value": 24
},
"symbols": {
"bytes": 321885,
"number": 32150
},
"time": {
"cpu": 0.43762001395225525,
"gc": 0.043000000000000003,
"gcFraction": 0.09825876017793679
},
"values": {
"bytes": 20363664,
"number": 848486
}
}
pkgsMusl.stdenv
{
"cpuTime": 0.5026220083236694,
"envs": {
"bytes": 4656672,
"elements": 324861,
"number": 257223
},
"gc": {
"cycles": 1,
"heapSize": 402915328,
"totalBytes": 125050816
},
"list": {
"bytes": 601264,
"concats": 4389,
"elements": 75158
},
"nrAvoided": 262676,
"nrExprs": 131023,
"nrFunctionCalls": 242926,
"nrLookups": 125858,
"nrOpUpdateValuesCopied": 3930750,
"nrOpUpdates": 13551,
"nrPrimOpCalls": 104327,
"nrThunks": 322854,
"sets": {
"bytes": 73163712,
"elements": 4542912,
"number": 29820
},
"sizes": {
"Attr": 16,
"Bindings": 16,
"Env": 8,
"Value": 24
},
"symbols": {
"bytes": 320546,
"number": 32025
},
"time": {
"cpu": 0.5026220083236694,
"gc": 0.07200000000000001,
"gcFraction": 0.14324880090335151
},
"values": {
"bytes": 32448624,
"number": 1352026
}
}
| 01:38:49 |
 emily | looks still expensive enough that we'd want to avoid it wherever possible? | 02:29:09 |
| emily | it's not clear to me if Firefox could just use an unwrapped compiler though | 02:29:22 |
| Tristan Ross | crossStdenv.predicated.useLLVM.configs.aarch64-unknown-linux-gnu
{
"cpuTime": 0.8687459826469421,
"envs": {
"bytes": 12327288,
"elements": 839812,
"number": 701099
},
"gc": {
"cycles": 1,
"heapSize": 402915328,
"totalBytes": 124386272
},
"list": {
"bytes": 1597240,
"concats": 14954,
"elements": 199655
},
"nrAvoided": 651102,
"nrExprs": 190283,
"nrFunctionCalls": 673020,
"nrLookups": 340854,
"nrOpUpdateValuesCopied": 2985262,
"nrOpUpdates": 30307,
"nrPrimOpCalls": 244291,
"nrThunks": 553576,
"sets": {
"bytes": 58833760,
"elements": 3619956,
"number": 57154
},
"sizes": {
"Attr": 16,
"Bindings": 16,
"Env": 8,
"Value": 24
},
"symbols": {
"bytes": 445341,
"number": 42001
},
"time": {
"cpu": 0.8687459826469421,
"gc": 0.061,
"gcFraction": 0.07021615203806976
},
"values": {
"bytes": 31742712,
"number": 1322613
}
}
pkgsLLVM.stdenv
{
"cpuTime": 1.1511069536209106,
"envs": {
"bytes": 10916216,
"elements": 771025,
"number": 593502
},
"gc": {
"cycles": 1,
"heapSize": 402915328,
"totalBytes": 258382960
},
"list": {
"bytes": 3100896,
"concats": 16000,
"elements": 387612
},
"nrAvoided": 624277,
"nrExprs": 189716,
"nrFunctionCalls": 558370,
"nrLookups": 220405,
"nrOpUpdateValuesCopied": 7006441,
"nrOpUpdates": 39748,
"nrPrimOpCalls": 191955,
"nrThunks": 873127,
"sets": {
"bytes": 148522576,
"elements": 9080341,
"number": 202320
},
"sizes": {
"Attr": 16,
"Bindings": 16,
"Env": 8,
"Value": 24
},
"symbols": {
"bytes": 444992,
"number": 41976
},
"time": {
"cpu": 1.1511069536209106,
"gc": 0.202,
"gcFraction": 0.17548325927889744
},
"values": {
"bytes": 66434280,
"number": 2768095
}
}
| 02:33:13 |
| Tristan Ross | Yeah, ideally no cross when possible. | 02:33:26 |
| Tristan Ross | From what I was able to gleam when trying to test the wasm cross stdenv, it looks like it's only necessary for sandboxing things in a way? We could provide an option but idk if it's worth it. | 02:34:48 |
| Tristan Ross | crossStdenv.predicated.useLLVM.configs.wasm32-unknown-wasi
{
"cpuTime": 0.8086940050125122,
"envs": {
"bytes": 9276688,
"elements": 643991,
"number": 515595
},
"gc": {
"cycles": 1,
"heapSize": 402915328,
"totalBytes": 113596128
},
"list": {
"bytes": 1192696,
"concats": 14033,
"elements": 149087
},
"nrAvoided": 507605,
"nrExprs": 191950,
"nrFunctionCalls": 489091,
"nrLookups": 246990,
"nrOpUpdateValuesCopied": 2948940,
"nrOpUpdates": 28801,
"nrPrimOpCalls": 197474,
"nrThunks": 490984,
"sets": {
"bytes": 57271296,
"elements": 3526449,
"number": 53007
},
"sizes": {
"Attr": 16,
"Bindings": 16,
"Env": 8,
"Value": 24
},
"symbols": {
"bytes": 446123,
"number": 42055
},
"time": {
"cpu": 0.8086940050125122,
"gc": 0.101,
"gcFraction": 0.12489272750134622
},
"values": {
"bytes": 29123448,
"number": 1213477
}
}
pkgsCross.wasi32.stdenv
{
"cpuTime": 1.1445599794387817,
"envs": {
"bytes": 11093168,
"elements": 793274,
"number": 593372
},
"gc": {
"cycles": 1,
"heapSize": 402915328,
"totalBytes": 257411904
},
"list": {
"bytes": 3087112,
"concats": 17218,
"elements": 385889
},
"nrAvoided": 634315,
"nrExprs": 191436,
"nrFunctionCalls": 554713,
"nrLookups": 216783,
"nrOpUpdateValuesCopied": 6831370,
"nrOpUpdates": 46625,
"nrPrimOpCalls": 194292,
"nrThunks": 908524,
"sets": {
"bytes": 146253904,
"elements": 8929195,
"number": 211674
},
"sizes": {
"Attr": 16,
"Bindings": 16,
"Env": 8,
"Value": 24
},
"symbols": {
"bytes": 446471,
"number": 42080
},
"time": {
"cpu": 1.1445599794387817,
"gc": 0.20500000000000002,
"gcFraction": 0.17910813210550902
},
"values": {
"bytes": 67181760,
"number": 2799240
}
}
| 02:36:27 |
| emily | RLBox is important, I mean what's the reason it can't use an unwrappd multi-target Clang? | 02:50:40 |
| emily | it uses libcxx for WASM, I guess? but does it use anything else from pkgsCross? | 02:50:52 |
| Tristan Ross | Yeah, idk | 02:51:04 |
| Tristan Ross | I think it needs wasilibc | 02:52:01 |
| Tristan Ross | Ok yeah, it needs a wasm toolchain. It looks like upstream uses the wasi-sdk. | 02:54:37 |
| Randy Eckenrode | How does crossStdenv handle cross-compiled dependencies? DXVK needs SPIRV and Vulkan headers and windows.pthreads. | 13:39:07 |
