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Now imagine a Threadripper with the Zen2 cores, higher IPC and frequency would be certainly welcome. Have the 32 core 2990WX and it's an incredible CPU for comp

Now imagine a Threadripper with the Zen2 cores, higher IPC and frequency would be certainly welcome. Have the 32 core 2990WX and it's an incredible CPU for compiling large C++ programs, running big test suites and never having to worry about running too many tasks at the same time.

danbolt 7y ago
A lot of AAA game studios with larger C++ codebases use Incredibuild a lot. I can imagine having something with this level of parallelism would be incredibly useful.
- gratilup 7y ago
  Don't even need Incredibuild, even MSBuild or just plain /MP option in VC++ can take advantage of it. A build from VS of the Unreal Engine 4 client takes around 2 min, for example.
  - danbolt 7y ago
    Agreed, utilizing multiple processes helps a lot, although a larger number of cores across the entire network helps a lot with compiling the mass of translation units. Most workplaces I’ve done C++ at have had extra IncrediBuild agents with Intel Xeons to help with that
  - gambiting 7y ago
    I mean, yes, but even that is not enough once the project is big enough. I work on a huge AAA game in C++ and on my 8-core 16-threaded Xeon the whole thing compiles in 40 minutes. Incredibuild is a must to keep the compilation times even remotely acceptable.
- ahartmetz 7y ago
  Icecream is the distributed compiler to use on Linux. Add ccache as needed.
empyrical 7y ago
Conjecture on my part, but I wouldn't be surprised if we also see a 64 core Threadripper - there's going to be a 64 core Epyc: https://wccftech.com/amd-7nm-epyc-64-core-32-core-cpus-specs-benchmarks-leaked/ https://wccftech.com/amd-7nm-epyc-64-core-32-core-cpus-specs... Although they may save it for a "Zen2+" or something similar, like they did with 32 core Threadripper
- chaosbutters314 7y ago
  I'm looking forward to dual socket 64 core epyc for at work (128 cores)
- bitL 7y ago
  I am specifically waiting for 64c Threadripper. Would be also great if 32GB UDIMM ECC became available by that time to bump up RAM from 128GB to 256GB. That computer could then last a decade.
loeg 7y ago
Hell, I have the older 16 core 1950X and it's amazing for compiling large codebases. I'd heartily recommend these things, performance for dollar is fantastic.
- pimeys 7y ago
  Having the 24-core 2970x and can comfirm, it is very nice for Rust development.
  - jaimeyap 7y ago
    Nice. What build times are you seeing for clean builds of the rust toolchain itself? Curious to benchmark against my 2700x. I'd imagine near linear scaling with the core count. I think the 3900x might be a happy middle ground. I'm guessing we would probably see (with the increased IPC, core count, and core clock) like 70-80% increases over a 2700x in these kinds of multithreaded workloads. So probably slightly more than half way to a 2970x or 2990wx?
    - loeg 7y ago
      3900x looks fantastic on paper. In general, if the Ryzen stuff is sufficient for your needs, it's a better value. You pay a big premium for the Threadripper boards (and big case and big cooling solution). So in that sense, the 3900x is definitely in a sweet spot at the top of the Ryzen range. Tradeoffs: threadripper boards officially support ECC; Ryzen boards are hit or miss. TR boards tend to be priced around $300 whereas you can get a Ryzen board for $100ish. TR had (prior generations) twice the DRAM channels and way more PCIe lanes than Ryzen, so if you're doing GPU-intense work or something else with use for lots of PCIe, that's a plus. Not to mention, additional core count over Ryzen, although with greater inter-die latency. Not sure what that will look like with TR3. Is 3900X worth $500 at list over $400 3800X at list? Actually, yeah, it looks at least 25% better to me (esp. the doubled L3) if you can use the cores. The 3800X is overpriced; they probably are learning from the 1700<->1800 dynamic in gen1. Is it worth it over the 3700X at $330? Maybe not. For me the question is really, how long will Ryzen 3000 be on the market before those better IPC/clocks/core densities show up in TR3? PCIe 4.0 support is huge; AMD wasn't anemic on PCIe channels on Zen and Zen+, and PCIe 4.0 doubles bandwidth from 3.0. Hopefully those IPC gains do not come attached to Spectre/Meltdown-like vulnerabilities. I'm excited for Zen 3 TR! That might be worth an upgrade from the 1950X. Meanwhile, it doesn't seem like Intel will get to PCIe 4 until 2020 (although that's reasonably soon).

danbolt 7y ago

A lot of AAA game studios with larger C++ codebases use Incredibuild a lot. I can imagine having something with this level of parallelism would be incredibly useful.

gratilup 7y ago
Don't even need Incredibuild, even MSBuild or just plain /MP option in VC++ can take advantage of it. A build from VS of the Unreal Engine 4 client takes around 2 min, for example.
- danbolt 7y ago
  Agreed, utilizing multiple processes helps a lot, although a larger number of cores across the entire network helps a lot with compiling the mass of translation units. Most workplaces I’ve done C++ at have had extra IncrediBuild agents with Intel Xeons to help with that
- gambiting 7y ago
  I mean, yes, but even that is not enough once the project is big enough. I work on a huge AAA game in C++ and on my 8-core 16-threaded Xeon the whole thing compiles in 40 minutes. Incredibuild is a must to keep the compilation times even remotely acceptable.
ahartmetz 7y ago
Icecream is the distributed compiler to use on Linux. Add ccache as needed.

empyrical 7y ago

Conjecture on my part, but I wouldn't be surprised if we also see a 64 core Threadripper - there's going to be a 64 core Epyc: https://wccftech.com/amd-7nm-epyc-64-core-32-core-cpus-specs-benchmarks-leaked/ https://wccftech.com/amd-7nm-epyc-64-core-32-core-cpus-specs... Although they may save it for a "Zen2+" or something similar, like they did with 32 core Threadripper

chaosbutters314 7y ago
I'm looking forward to dual socket 64 core epyc for at work (128 cores)
bitL 7y ago
I am specifically waiting for 64c Threadripper. Would be also great if 32GB UDIMM ECC became available by that time to bump up RAM from 128GB to 256GB. That computer could then last a decade.

loeg 7y ago

Hell, I have the older 16 core 1950X and it's amazing for compiling large codebases. I'd heartily recommend these things, performance for dollar is fantastic.

pimeys 7y ago
Having the 24-core 2970x and can comfirm, it is very nice for Rust development.
- jaimeyap 7y ago
  Nice. What build times are you seeing for clean builds of the rust toolchain itself? Curious to benchmark against my 2700x. I'd imagine near linear scaling with the core count. I think the 3900x might be a happy middle ground. I'm guessing we would probably see (with the increased IPC, core count, and core clock) like 70-80% increases over a 2700x in these kinds of multithreaded workloads. So probably slightly more than half way to a 2970x or 2990wx?
  - loeg 7y ago
    3900x looks fantastic on paper. In general, if the Ryzen stuff is sufficient for your needs, it's a better value. You pay a big premium for the Threadripper boards (and big case and big cooling solution). So in that sense, the 3900x is definitely in a sweet spot at the top of the Ryzen range. Tradeoffs: threadripper boards officially support ECC; Ryzen boards are hit or miss. TR boards tend to be priced around $300 whereas you can get a Ryzen board for $100ish. TR had (prior generations) twice the DRAM channels and way more PCIe lanes than Ryzen, so if you're doing GPU-intense work or something else with use for lots of PCIe, that's a plus. Not to mention, additional core count over Ryzen, although with greater inter-die latency. Not sure what that will look like with TR3. Is 3900X worth $500 at list over $400 3800X at list? Actually, yeah, it looks at least 25% better to me (esp. the doubled L3) if you can use the cores. The 3800X is overpriced; they probably are learning from the 1700<->1800 dynamic in gen1. Is it worth it over the 3700X at $330? Maybe not. For me the question is really, how long will Ryzen 3000 be on the market before those better IPC/clocks/core densities show up in TR3? PCIe 4.0 support is huge; AMD wasn't anemic on PCIe channels on Zen and Zen+, and PCIe 4.0 doubles bandwidth from 3.0. Hopefully those IPC gains do not come attached to Spectre/Meltdown-like vulnerabilities. I'm excited for Zen 3 TR! That might be worth an upgrade from the 1950X. Meanwhile, it doesn't seem like Intel will get to PCIe 4 until 2020 (although that's reasonably soon).