cl_khr_fp64 unsupported message on Xeon processor

George_L_1 · ‎05-16-2016

I'm getting a message saying that the extension is unsupported (error: OpenCL extension 'cl_khr_fp64' is unsupported)

However some quick googling shows that it should be working fine for Xeon processors.

Here are the specs:

processor: Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz

OS:Red Hat Enterprise Linux Server release 7.2 (Maipo)
driver info:
filename: /lib/modules/3.10.0-327.13.1.el7.x86_64/kernel/drivers/gpu/drm/vmwgfx/vmwgfx.ko
version: 2.6.1.0
license: GPL and additional rights
description: Standalone drm driver for the VMware SVGA device
rhelversion: 7.2
srcversion: 4685CBF19B4B0C5C6B8E6FC

tool version:
intel code builder 2015 - 5.0.0.62 x64

Interestingly enough, running the kernel on a docker container with the same SDK will succeed - I used this dockerfile specifically: https://github.com/d9magai/docker-opencl/blob/master/Dockerfile

I'm also tried the most recent Intel OpenCL runtime, 16.1 but the issue still persists.

Outside of the docker container it can be reproduced when attempting to build any OpenCL kernel with the pragma for the extension. For instance, attempting to build the kernel from https://github.com/hpc12/tools will give you the error.

To build and run, type 'make' and then `./cl-demo 1000000 10'

Robert_I_Intel · ‎05-16-2016

Hi George,

Yes, this extension should be supported on the CPU. Let me talk to the development team to see if they have any idea what is going on and get back to you.

Thank you for reporting the issue!

Robert_I_Intel · ‎05-17-2016

Hi George,

Couple of questions:

1. Are you running on a VM or directly on a hardware?

2. Could you provide a small reproducer code where you see this issue?

Thanks!

George_L_1 · ‎05-17-2016

Hi Robert,

I'm running on VMware right now. You can reproduce this bug by cloning https://github.com/hpc12/tools and building and running `./cl-demo 1000000 10'.

Robert_I_Intel · ‎05-20-2016

Hi George,

Could you please run the following command and let me know what the results are:

cat /proc/cpuinfo | grep "flags"

George_L_1 · ‎05-20-2016

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm

Robert_I_Intel · ‎05-26-2016

Hi George,

We are investigating the issue: could you please provide us with a version of VMWare you are using and proved the full output of the command "cat /proc/cpuinfo"?

Thanks,

George_L_1 · ‎06-01-2016

Hi Robert,

I apologize for the late response. The version of VMWare is VMWare ESXi 5.5.0. Here's the result of cpuinfo:

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 0
cpu cores : 8
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni
ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 1
cpu cores : 8
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 2
cpu cores : 8
apicid : 2
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 3
cpu cores : 8
apicid : 3
initial apicid : 3
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 4
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 4
cpu cores : 8
apicid : 4
initial apicid : 4
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 5
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 5
cpu cores : 8
apicid : 5
initial apicid : 5
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 6
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 6
cpu cores : 8
apicid : 6
initial apicid : 6
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
stepping : 4
microcode : 0x428
cpu MHz : 2799.999
cache size : 25600 KB
physical id : 0
siblings : 8
core id : 7
cpu cores : 8
apicid : 7
initial apicid : 7
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb pln pts dtherm
bogomips : 5599.99
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

Robert_I_Intel · ‎06-01-2016

Thanks, George! I communicated this info to the driver development team, let's see what they find out.