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Dec 21, 2021 Replied to a topic by yezheyu › 程序员 › 关于编码的一些疑问？ |
https://docs.python.org/zh-cn/3/reference/lexical_analysis.html#integer-literals
fd = open('./a.test', 'xb')
fd.write(b'0b01000001')
fd = open('./a.test', 'xb')
fd.write(b'0b01000001')
Mar 18, 2021 Replied to a topic by LeeReamond › Python › 有没有人注意观察过， Python 多进程执行同一程序速度比单进程执行慢很多，原因是什么？ |
(base) [root@bigdata ~]# python a.py
Single thread execute time: 4.8245 s
Multi thread execute time: 39.3859 s , speedup: 0.98 x
Multi Process execute time: 5.0472 s , speedup: 7.65 x
(base) [root@bigdata ~]# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
座： 1
NUMA 节点： 1
厂商 ID： GenuineIntel
CPU 系列： 6
型号： 85
型号名称： Intel(R) Xeon(R) Gold 6266C CPU @ 3.00GHz
步进： 7
CPU MHz： 3000.000
BogoMIPS： 6000.00
超管理器厂商： KVM
虚拟化类型： 完全
L1d 缓存： 32K
L1i 缓存： 32K
L2 缓存： 1024K
L3 缓存： 30976K
NUMA 节点 0 CPU： 0-7
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 eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 arat avx512_vnni md_clear spec_ctrl intel_stibp flush_l1d arch_capabilities
(base) [root@bigdata ~]#
Single thread execute time: 4.8245 s
Multi thread execute time: 39.3859 s , speedup: 0.98 x
Multi Process execute time: 5.0472 s , speedup: 7.65 x
(base) [root@bigdata ~]# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
座： 1
NUMA 节点： 1
厂商 ID： GenuineIntel
CPU 系列： 6
型号： 85
型号名称： Intel(R) Xeon(R) Gold 6266C CPU @ 3.00GHz
步进： 7
CPU MHz： 3000.000
BogoMIPS： 6000.00
超管理器厂商： KVM
虚拟化类型： 完全
L1d 缓存： 32K
L1i 缓存： 32K
L2 缓存： 1024K
L3 缓存： 30976K
NUMA 节点 0 CPU： 0-7
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 eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 arat avx512_vnni md_clear spec_ctrl intel_stibp flush_l1d arch_capabilities
(base) [root@bigdata ~]#
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