search

gonum / blas

A BLAS implementation for Go [DEPRECATED]
172 stars 16 forks source link

cc1.exe: sorry, unimplemented: 64-bit mode not compiled in #200

Closed Ravenwater closed 7 years ago

Ravenwater commented 7 years ago

What has gone wrong when you are greeted with that error?

tomtz@SW-LAPTOP-250 MINGW64 /C/Users/tomtz/dev $ CGO_LDFLAGS="-lmkl_rt" go install github.com/gonum/blas/cgo

github.com/gonum/blas/cgo

cc1.exe: sorry, unimplemented: 64-bit mode not compiled in

kortschak commented 7 years ago

From a quick google search it looks like you have not installed the 64-bit MinGW compiler, but have installed the 64-bit Go compiler. This is described in https://golang.org/issue/3441.

Ravenwater commented 7 years ago

Still haven't gotten a working cgo environment under Windows, but in the process of running

$ CGO_LDFLAGS="-lmkl_rt" go install github.com/gonum/blas/cgo

that seems to have installed the gonum/internal/asm tree that was prohibiting compilation.

Need to do more digging to discover how gonum dependencies and cgo integration is setup so I can use it with MKL. Am I missing some installation guide/explanation somewhere?

btracey commented 7 years ago

There is no setup guide for MKL on Windows.

Gonum has implemented blas and lapack in native Go, and for small-ish problems (n < 100), I've found Go is typically faster than calling into OpenBLAS. My point being, I usually do not use blas/cgo.

When I do use OpenBLAS, I clone it to ~/software/OpenBLAS, and make it. I then set CGO_LDFLAGS="-L/Users/brendan/software/OpenBLAS -lopenblas" and it works fine.

I don't know what the appropriate translations are for mkl or windows, sorry.

btracey commented 7 years ago

When you do get it working, I'd be interested to see benchmarks if you're willing to run them to see how much behind MKL we are.

Ravenwater commented 7 years ago

I'll sign up for that benchmark. To confirm, you would like to see the following comparisons?

Native Go BLAS <-> MKL Gonum w OpenBLAS <-> MKL

I tried to make OpenBLAS on cygwin and the makefile blows up. OpenBLAS suggests to use the binary distribution on Windows, so I do have that, but haven't found the mechanism yet to connect it to CGO.

I like benchmarking problems, so I'll continue to peel the onion....

vladimir-ch commented 7 years ago

FYI, you can see some benchmarks that compare Gonum with OpenBLAS and MKL in https://github.com/gonum/lapack/pull/193