Docker desktop utilize all cores 100% but host machine CPU usage is around 5%

Docker Desktop
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Hi,

Docker desktop says: 798.72% / 800% (8 CPUs available), and at the bottom of the app 100% CPU. Windows task manager says ~5% CPU usage. How to make Docker utilise the unused host CPU capacity? RAM usage in Docker is around 50% of the allocated, so that is fine.

Docker desktop: 4.42.1 (196648) using WSL 2-based engine
Windows OS: Windows Server 2022 Standard 21H2 build: 20348.3807

Windows task manager:
CPU: Intel(R) Xeon(R) Gold 6342 CPU @ 2.8GHz
Cores: 8
Logical processors: 8

WSL config:

[wsl2]
processors=8
memory=16GB
swap=8GB

pageReporting=false
vmIdleTimeout=-1

localhostForwarding=true
nestedVirtualization=false

cat /proc/cpuinfo inside WSL gives 8 sections of the below data. Note, it shows 8 siblings and 8 cores.

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 106
model name      : Intel(R) Xeon(R) Gold 6342 CPU @ 2.80GHz
stepping        : 6
microcode       : 0xffffffff
cpu MHz         : 2793.437
cache size      : 36864 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 8
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 27
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 cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch ssbd ibrs ibpb stibp ibrs_enhanced fsgsbase bmi1 avx2 smep bmi2 erms invpcid avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves avx512vbmi umip avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid fsrm md_clear flush_l1d arch_capabilities
bugs            : spectre_v1 spectre_v2 spec_store_bypass swapgs itlb_multihit mmio_stale_data retbleed eibrs_pbrsb gds bhi
bogomips        : 5586.87
clflush size    : 64
cache_alignment : 64
address sizes   : 45 bits physical, 48 bits virtual
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I’m not sure where to look for this displayed in Docker Desktop. Can you make a screenshot of that part? I only see the percentage of used CPU resources, no 800%. I guess I’m not looking at the same part. The bottom of the window where CPU and memory usage is shown.

Maybe it was a bug in the GUI of Docker Desktop in the version you are using. There is 4.43.1 now. You could try to update, but docker doesn’t limit how much CPU you can use.

If Windows shows you are not using CPUs and Docker shows you are, Windows probably knows better.

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