Intel i7 with 8 cores - just one core computing

[bernd.lentes]

Hi,

thanks for your help.
I'm struggling with the output of hashcat -I:

CUDA Info:
==========

CUDA.Version.: 11.0

Backend Device ID #1 (Alias: #2)
  Name...........: GeForce GTX 1050
  Processor(s)...: 5
  Clock..........: 1455
  Memory.Total...: 1999 MB
  Memory.Free....: 1424 MB

OpenCL Info:
============

OpenCL Platform ID #1
  Vendor..: NVIDIA Corporation
  Name....: NVIDIA CUDA
  Version.: OpenCL 1.2 CUDA 11.0.185

  Backend Device ID #2 (Alias: #1)
    Type...........: GPU
    Vendor.ID......: 32
    Vendor.........: NVIDIA Corporation
    Name...........: GeForce GTX 1050
    Version........: OpenCL 1.2 CUDA
    Processor(s)...: 5
    Clock..........: 1455
    Memory.Total...: 1999 MB (limited to 499 MB allocatable in one block)
    Memory.Free....: 1408 MB
    OpenCL.Version.: OpenCL C 1.2
    Driver.Version.: 450.36.06

OpenCL Platform ID #2
  Vendor..: Intel(R) Corporation
  Name....: Intel(R) CPU Runtime for OpenCL(TM) Applications
  Version.: OpenCL 2.1 LINUX

  Backend Device ID #3
    Type...........: CPU
    Vendor.ID......: 8
    Vendor.........: Intel(R) Corporation
    Name...........: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
    Version........: OpenCL 2.1 (Build 0)
    Processor(s)...: 8
    Clock..........: 3400
    Memory.Total...: 64286 MB (limited to 16071 MB allocatable in one block)
    Memory.Free....: 64222 MB
    OpenCL.Version.: OpenCL C 2.0
    Driver.Version.: 18.1.0.0920

It seems that i have two different OpenCL versions: one from CUDA (nVidia), one from Intel.
Is that a problem ?

And why is it reporting that the GeForce graphic adapter has 5 processors ?
In the net i found that it has 640 processors.

I try:./hashcat.bin -D 1,2 -m 7100 -a 3 macos.hash -1 ?l?u?d ?1?1?1?1?1?1
-D 1,2 shoud use GPU and CPU, right ?

Output:
CUDA API (CUDA 11.0)
====================
* Device #1: GeForce GTX 1050, 1424/1999 MB, 5MCU

OpenCL API (OpenCL 1.2 CUDA 11.0.185) - Platform #1 [NVIDIA Corporation]
========================================================================
* Device #2: GeForce GTX 1050, skipped

OpenCL API (OpenCL 2.1 LINUX) - Platform #2 [Intel(R) Corporation]
==================================================================
* Device #3: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz, 64222/64286 MB (16071 MB allocatable), 8MCU

All CPU cores are computing following top:
PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM    TIME+ COMMAND

8608 root      20  0 15,163g 788848 161644 S 722,3  1,2  16:47.64 hashcat.bin

You are right, it does not seem to be quicker.

What is the difference between a backend device and a OpenCL device ?

Thanks,

Bernd