is whisper.cpp's inference time slower than original python implementation?

[utkarshsurwade]

I conducted a short experiment on 1-hour video (https://www.youtube.com/watch?v=j1Hag4Kbpjs) on google colab cpu regarding the inference time of the two implementations.

ggml-base.bin | 20min 5s 32min 29sec (colab cpu)
ggml-small.bin | 55min 32s 1hour 29min 15sec (colab cpu)
ggml-large.bin | 4h 58min 6s 9hour 33min 3sec (colab cpu)

Base whisper python | 11min 27s 18min 23 sec (colab cpu)
Small whisper python | 24min 24s 47min 10sec (colab cpu)
Large whisper python | 47min 41sec 4hour 45min 10sec (colab cpu)

is whisper.cpp's inference time slower than original python implementation for devices other then apple/mac?

[ggerganov]

Shouldn't be the case - in my experiments whisper.cpp is slightly faster to PyTorch on x86 CPUs.

Probably whisper.cpp is not compiled properly. Please provide the output of the following commands:

make clean
make bench
./bench -m models/ggml-small.bin -t 8

Also, are you sure you are comparing against PyTorch CPU? Your result shows that large transcribes faster than realtime (47min < 1h) which is not what I have observed on any CPU other than M1. Can you show the command that you use to run whisper python?

Also, would be useful to take a look at the CPU model: cat /proc/cpuinfo

[utkarshsurwade]

Hello,

I must have conducted the previous experiment on different system, the updated experiment is conducted on google colab cpu.

please find the notebook links attached below:
https://colab.research.google.com/drive/1e1Bi79TSSrqGHgV1N9Z36qrlIqHYWHjW#scrollTo=wJnnb3MAWoOW
https://colab.research.google.com/drive/1JXiAV_Q2adYbclSJN31ga-oaA0NoW7Vt#scrollTo=YeSnU-ZrJH_4

output of make clean:
rm -f *.o main stream command bench libwhisper.a libwhisper.so

output of make bench:
cc -I. -O3 -std=c11 -fPIC -pthread -mavx -mavx2 -mfma -mf16c -c ggml.c -o ggml.o g++ -I. -I./examples -O3 -std=c++11 -fPIC -pthread -c whisper.cpp -o whisper.o g++ -I. -I./examples -O3 -std=c++11 -fPIC -pthread examples/bench/bench.cpp ggml.o whisper.o -o bench

output of ./bench -m models/ggml-small.bin -t 8:

whisper_model_load: loading model from 'models/ggml-small.bin'
whisper_model_load: n_vocab       = 51865
whisper_model_load: n_audio_ctx   = 1500
whisper_model_load: n_audio_state = 768
whisper_model_load: n_audio_head  = 12
whisper_model_load: n_audio_layer = 12
whisper_model_load: n_text_ctx    = 448
whisper_model_load: n_text_state  = 768
whisper_model_load: n_text_head   = 12
whisper_model_load: n_text_layer  = 12
whisper_model_load: n_mels        = 80
whisper_model_load: f16           = 1
whisper_model_load: type          = 3
whisper_model_load: adding 1608 extra tokens
whisper_model_load: mem_required  = 1044.00 MB
whisper_model_load: ggml ctx size =  464.56 MB
whisper_model_load: memory size   =   68.48 MB
whisper_model_load: model size    =  464.44 MB

system_info: n_threads = 8 / 2 | AVX = 1 | AVX2 = 1 | AVX512 = 0 | NEON = 0 | F16C = 1 | FP16_VA = 0 | WASM_SIMD = 0 | BLAS = 0 | 

whisper_print_timings:     load time =   778.11 ms
whisper_print_timings:      mel time =     0.00 ms
whisper_print_timings:   sample time =     0.00 ms
whisper_print_timings:   encode time = 42908.63 ms / 3575.72 ms per layer
whisper_print_timings:   decode time =     0.00 ms / 0.00 ms per layer
whisper_print_timings:    total time = 43686.78 ms

If you wish, you can submit these results here:

  https://github.com/ggerganov/whisper.cpp/issues/89

Please include the following information:

  - CPU model
  - Operating system
  - Compiler

output of cat /proc/cpuinfo:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 1
initial apicid	: 1
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

Command to run whisper python is:

model = whisper.load_model("small")
result = model.transcribe(f'one_hour_vid.mp4')

[vivekmettu]

I had conducted a similar experiment with this video https://www.youtube.com/watch?v=xz3tjI5cmrQ which is around 15mins. I used whisper CPP and Python models (base, small and large) for comparison in both Kaggle and Colab environments . Here are the results.

https://www.youtube.com/watch?v=xz3tjI5cmrQ		Kaggle			Colab
	WER	CER	Time taken to get transcripts	WER	CER	Time taken to get transcripts
Whisper base CPP	0.046104	0.024655	3min 48sec	0.043720	0.023624	6min 34sec
Whisper small CPP	0.042527	0.025289	11min 40sec	0.042130	0.023465	20min 13sec
Whisper large CPP	0.036963	0.024496	1hr 8min 44sec	0.036168	0.023783	2hr 2min 21sec
Whisper base Python	0.048092	0.026874	2min 52sec	0.046502	0.025844	4min 2sec
Whisper small Python	0.037758	0.017599	8min 4sec	0.037758	0.017599	12min 7sec
Whisper large Python	0.022257	0.011098	42min 9sec	0.022257	0.011098	1hr 18min 9sec

Code used for whisper CPP models

!make

!./main -m /content/ggml-large.bin -f /content/audio.wav -nt true -otxt

Code used for whisper Python models

large_py = whisper.load_model("large")
large_py_text = large_py.transcribe("/content/audio.wav", language="en")

Info of Google Colab CPU:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 1
initial apicid	: 1
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:  

Info of Kaggle CPU:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 4
core id		: 1
cpu cores	: 2
apicid		: 2
initial apicid	: 2
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

processor	: 2
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 2
apicid		: 1
initial apicid	: 1
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

processor	: 3
vendor_id	: GenuineIntel
cpu family	: 6
model		: 79
model name	: Intel(R) Xeon(R) CPU @ 2.20GHz
stepping	: 0
microcode	: 0x1
cpu MHz		: 2199.998
cache size	: 56320 KB
physical id	: 0
siblings	: 4
core id		: 1
cpu cores	: 2
apicid		: 3
initial apicid	: 3
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt arat md_clear arch_capabilities
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa mmio_stale_data retbleed
bogomips	: 4399.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 46 bits physical, 48 bits virtual
power management:

Here also, the Python implementations of Whisper are faster compared to CPP implementations while using CPU. Are there any settings that we need to use/change to improve performance of whisper CPP models?