| 4 Apr 2024 |
 Alex | GHC is quite tricky to compile, so I'd be pleasantly surprised if Sulong were capable of handling it.
Historically, using Hugs to run GHC on itself has been an option, but AFAIK Hugs doesn't support 64-bit ISAs and it also has a relatively low limit on program size that makes bootstrapping GHC even on x86 a nightmare. I don't know what it would take to support RV64GC and I haven't explored patching Hugs to raise the program size limitations. | 12:24:58 |
| Alex | Also Hugs requires an ancient version of GCC. | 12:25:47 |
| Alex | Looking into Sulong, apparently it's not a Haskell compiler/interpreter but an LLVM bitcode interpreter?
That doesn't seem suitable for compiling GHC (Haskell code) from source.
LLVM bitcode isn't the problem here. | 12:29:37 |
 ShalokShalom | Graal and Sulong are able to produce a native image of Haskell code | 12:41:42 |
| ShalokShalom | Graal provides two runtimes: JVM and Truffle. Sulong is the LLVM implementation on Truffle | 12:42:09 |
| ShalokShalom | Hugs is even older than Eta, so I doubt very much it can compile any modern Haskell code at all? | 12:42:35 |
 Pratham Patel (you can mention me) | In reply to @skeuchel:matrix.org
Here are my estimates
On the pioneer:
Unregisterised release+profiled_libs: >30h
Unregisterised quick+no_profiled_libs: 18h
Registerised release+profiled_libs: 12h
Registerised quick+no_profiled_libs: 9h
Using qemu user-mode
Registerised release+profiled_libs: 8h
Registerised quick+no_profiled_libs: 6h
Yeah, the multi-core interconnects are only present to connect the cores, not much more. i.e. not how 64-cores are interconnected on threadrippers/eypcs;
So here, qemu-emulation on x86 will be faster tbh
| 12:43:10 |
 Steven Keuchel | In reply to @thefossguy:matrix.org
Yeah, the multi-core interconnects are only present to connect the cores, not much more. i.e. not how 64-cores are interconnected on threadrippers/eypcs;
So here, qemu-emulation on x86 will be faster tbh
Most of the stuff I compile is quicker on the pioneer than user-mode emulations, so there's still something GHC-specific to it. Compiling w/o ilbnuma? Larger caches on x86? More "symbolic computations" in comparison to gcc? | 12:57:44 |
| Pratham Patel (you can mention me) | There's obviously a lot of moving parts to this :) | 12:58:43 |
| Pratham Patel (you can mention me) | What I meant to say was, you're not actually using all 64-cores on the pioneer "efficiently" because the interconnects aren't well. It's a first gen product. Impressive that they could even pull it off, a first gen product nonetheless. | 12:59:42 |
| Alex | In reply to @shalokshalom:kde.org
Hugs is even older than Eta, so I doubt very much it can compile any modern Haskell code at all? It doesn't need to. It only needs to be able to interpret an old version of GHC, then the build can work its way up to a modern GHC. | 13:43:26 |
| ShalokShalom | Yeah, true. | 14:03:45 |
| ShalokShalom | Well then, Eta might be a choice. It has a native Haskell compiler for 7 and even some features of 8, probably better than Hugs 🤷 | 14:05:07 |
|  rtunreal joined the room. | 15:23:24 |
|  jopejoe1 joined the room. | 16:22:35 |
 ion | Redacted or Malformed Event | 18:06:30 |
