PHP-FPM Different Php versions on different vhosts. Possible?

yeah multiple PHP versions is on Centmin Mod to do list just not ready for public release/support yet

preview of one of the many ways it could be implemented at PHP-FPM - addons/php71.sh - Multiple PHP-FPM Versions Work Preview but note multiple PHP versions means more cpu and memory usage too so if you have one PHP-FPM version using 1-2GB memory and 4 cpus, having 2 or 3 more PHP-FPM versions means potentially using 2x3 = 6GB memory and 4x3 = 12 cpus. So if your server doesn't have memory or cpu resources to support multiple PHP-FPM versions, PHP performance will suffer more than the gains you made by using PHP 7.3+ for some web apps and not others too.

FYI, Centmin Mod 123.09beta01's PHP-FPM with PHP_PGO='y' enabled will have PHP performance once major version above distro YUM PHP versions. So Centmin Mod PHP-FPM 7.2.2 + PGO enabled has performance close to standard YUM PHP 7.3. So if you used Centmin Mod PHP + PGO enabled 7.2.22, it will be performing close to other distro's PHP 7.3

 

PHP 7.3 + PGO is as fast as PHP 7.4 YUM distro and PHP 7.4 + PGO is faster than any PHP 7.4 YUM distro version

Might be too old as E5-2650v1 is Sandybridge cpu and won't have AVX2 cpu support which is what makes PHP 7.3+ and 7.4+ faster as it uses AVX2 when the cpu supports it. AVX2 is supported on Intel Haswell or newer cpus including AMD EPYC/Ryzen too Advanced Vector Extensions - Wikipedia

PHP + PGO will be faster, but a cpu with AVX2 support will make PHP 7.3+ even faster. But as your cpu E5-2650v1 doesn't have AVX2 support, PHP 7.3+ won't be as fast as it can be anyway, so even PHP 7.2 + PGO would be fast enough for a E5-2650v1

 

PHP_PGO='y' implies GCCINTEL_PHP='y' already

 

Intell Haswell or newer is Xeon E3-12xx v3 (Haswell) or newer, Xeon E5-26xx v4 (Broadwell) or Intel Xeon Silver/Gold/Platinum Scalable Skylake cpus

to check if avx2 is supported run on non-openvz systems command below and check cpu flags for avx2

Code (Text):

lscpu

or openvz systems

Code (Text):

cat /proc/cpuinfo

example is this on latest generation Intel Xeon E-2276G Coffelake cpu 6 core/12 cpu thread server under cpu flags there's avx2 support

Code (Text):

lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                12
On-line CPU(s) list:   0-11
Thread(s) per core:    2
Core(s) per socket:    6
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 158
Model name:            Intel(R) Xeon(R) E-2276G CPU @ 3.80GHz
Stepping:              10
CPU MHz:               799.938
CPU max MHz:           4900.0000
CPU min MHz:           800.0000
BogoMIPS:              7584.00
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              12288K
NUMA node0 CPU(s):     0-11
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb intel_pt ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear spec_ctrl intel_stibp flush_l1d

this is on AMD Ryzen 3600 (AMD Zen2) with avx2

Code (Text):

lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                12
On-line CPU(s) list:   0-11
Thread(s) per core:    2
Core(s) per socket:    6
Socket(s):             1
NUMA node(s):          1
Vendor ID:             AuthenticAMD
CPU family:            23
Model:                 113
Model name:            AMD Ryzen 5 3600 6-Core Processor
Stepping:              0
CPU MHz:               2200.000
CPU max MHz:           3600.0000
CPU min MHz:           2200.0000
BogoMIPS:              7186.94
Virtualization:        AMD-V
L1d cache:             32K
L1i cache:             32K
L2 cache:              512K
L3 cache:              16384K
NUMA node0 CPU(s):     0-11
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc art rep_good nopl xtopology nonstop_tsc extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_l2 cpb cat_l3 cdp_l3 hw_pstate sme retpoline_amd ssbd ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif umip overflow_recov succor smca

and AMD Ryzen 3800X 8C/16T cpu

Code (Text):

lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                16
On-line CPU(s) list:   0-15
Thread(s) per core:    2
Core(s) per socket:    8
Socket(s):             1
NUMA node(s):          1
Vendor ID:             AuthenticAMD
CPU family:            23
Model:                 113
Model name:            AMD Ryzen 7 3800X 8-Core Processor
Stepping:              0
CPU MHz:               2800.000
CPU max MHz:           3900.0000
CPU min MHz:           2200.0000
BogoMIPS:              7785.17
Virtualization:        AMD-V
L1d cache:             32K
L1i cache:             32K
L2 cache:              512K
L3 cache:              16384K
NUMA node0 CPU(s):     0-15
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc art rep_good nopl xtopology nonstop_tsc extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_l2 cpb cat_l3 cdp_l3 hw_pstate sme retpoline_amd ssbd ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif umip overflow_recov succor smca

Yes look forward to some Centmin Mod PHP and other benchmark comparisons on Intel Xeon E-2276G 6C/12T vs AMD Ryzen 3600 6C/12T vs AMD Ryzen 3800X 8C/16T dedicated servers soon

PHP 7.3 + PGO will still be faster than PHP 7.2 + PGO in theory, just if you have 2 web apps where you want PHP 7.2 and 7.3 supported by multiple PHP versions, you won't have that in Centmin Mod right now, so PHP 7.2 + PGO would fit you needs especially as PHP 7.3 won't be as fast with a cpu without AVX2 support.

 

coincidentally, Phoronix just posted benchmarks for Intel Sandybridge vs 2 generations older Intel 8700K Coffee Lake and AMD Ryzen 2600X and Ryzen 3600X The Sandy Bridge Core i7 3960X Benchmarked Against Today's Six-Core / 12 Thread AMD/Intel CPUs - Phoronix. Intel Sandybridge which your Xeon E5-2650v1 based off of, is really showing it's age now !

 

if each site has different PHP version, and each site is heavy PHP users, then yes you'd increase respective PHP versions resource usage for cpu and memory by a factor that is linked to how many PHP versions are running.

Reason is each PHP version has to have it's own separate PHP-FPM pools and PHP-FPM master processes and own Zend Opcache cache. So yes if you allocated 512MB to each Zend Opcache cache, and have 5x PHP versions running, you'd need a maximum of 5x 512MB = 2.5GB of memory to service all 5x PHP version's Zend Opcache cache requirements at the maximum end. And if each PHP version's master/children etc use 1GB of memory, than 5x PHP versions require 5x1 = 5GB memory.

So in total for each PHP version + Zend Opcache memory allocation, the theoretical max memory used is 5x (1+0.5) = 7.5GB of memory.

If you have each PHP version using 2GB of memory and 1GB Zend Opcache memory allocation/usage, then total memory usage would be 5x (2+1) = 15GB of memory.

That doesn't count cpu usage each PHP version can use i.e. 4 cpus per PHP version would mean in theory, 5x4 = 20 cpu utilisation or 2000% cpu utilisation.

This is ps output of cpu and memory usage of idle server with multiple PHP-FPM versions installed - remember this is idle right now so memory usage increases with usage.

This Centmin Mod 123.09beta01 server with multiple PHP-FPM versions has 32GB of memory available though.

Code (Text):

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND

root     14620  0.0  0.0 1366368 14480 ?       Ss   Aug31   0:12 php-fpm: master process (/etc/opt/remi/php72/php-fpm.conf)
nginx    14621  0.0  0.0 1366632 10840 ?       S    Aug31   0:00  \_ php-fpm: pool php72-www
nginx    14622  0.0  0.0 1366632 10840 ?       S    Aug31   0:00  \_ php-fpm: pool php72-www
nginx    14623  0.0  0.0 1366632 10884 ?       S    Aug31   0:00  \_ php-fpm: pool php72-www
nginx    14624  0.0  0.0 1366632 10888 ?       S    Aug31   0:00  \_ php-fpm: pool php72-www
nginx    14625  0.0  0.0 1366632 10888 ?       S    Aug31   0:00  \_ php-fpm: pool php72-www
nginx    20363  0.0  0.0 1366632 11080 ?       S    Sep10   0:00  \_ php-fpm: pool php72-www
root     21600  0.0  0.0 1372192 25680 ?       Ss   Sep12   0:02 php-fpm: master process (/etc/opt/remi/php74/php-fpm.conf)
nginx    21607  0.0  0.0 1372192 11608 ?       S    Sep12   0:00  \_ php-fpm: pool php74-www
nginx    21608  0.0  0.0 1372192 11372 ?       S    Sep12   0:00  \_ php-fpm: pool php74-www
nginx    21609  0.0  0.0 1372192 11620 ?       S    Sep12   0:00  \_ php-fpm: pool php74-www
nginx    21610  0.0  0.0 1372192 11372 ?       S    Sep12   0:00  \_ php-fpm: pool php74-www
nginx    21611  0.0  0.0 1372192 11376 ?       S    Sep12   0:00  \_ php-fpm: pool php74-www
root     21652  0.0  0.0 1375836 25540 ?       Ss   Sep12   0:02 php-fpm: master process (/etc/opt/remi/php73/php-fpm.conf)
nginx    21654  0.0  0.0 1375996 11648 ?       S    Sep12   0:00  \_ php-fpm: pool php73-www
nginx    21655  0.0  0.0 1375996 11616 ?       S    Sep12   0:00  \_ php-fpm: pool php73-www
nginx    21656  0.0  0.0 1375996 11844 ?       S    Sep12   0:00  \_ php-fpm: pool php73-www
nginx    21657  0.0  0.0 1375996 11552 ?       S    Sep12   0:00  \_ php-fpm: pool php73-www
nginx    21658  0.0  0.0 1376000 11524 ?       S    Sep12   0:00  \_ php-fpm: pool php73-www
root     21670  0.0  0.0 1359208 20968 ?       Ss   Sep12   0:02 php-fpm: master process (/etc/opt/remi/php71/php-fpm.conf)
nginx    21671  0.0  0.0 1359472 10016 ?       S    Sep12   0:00  \_ php-fpm: pool php71-www
nginx    21672  0.0  0.0 1359472 9988 ?        S    Sep12   0:00  \_ php-fpm: pool php71-www
nginx    21673  0.0  0.0 1359472 9988 ?        S    Sep12   0:00  \_ php-fpm: pool php71-www
nginx    21674  0.0  0.0 1359472 9980 ?        S    Sep12   0:00  \_ php-fpm: pool php71-www
nginx    21675  0.0  0.0 1359472 9976 ?        S    Sep12   0:00  \_ php-fpm: pool php71-www
root     21687  0.0  0.0 1325396 20548 ?       Ss   Sep12   0:02 php-fpm: master process (/etc/opt/remi/php70/php-fpm.conf)
nginx    21688  0.0  0.0 1325528 10324 ?       S    Sep12   0:00  \_ php-fpm: pool php70-www
nginx    21689  0.0  0.0 1325528 10304 ?       S    Sep12   0:00  \_ php-fpm: pool php70-www
nginx    21690  0.0  0.0 1325528 10304 ?       S    Sep12   0:00  \_ php-fpm: pool php70-www
nginx    21691  0.0  0.0 1325528 10292 ?       S    Sep12   0:00  \_ php-fpm: pool php70-www
nginx    21692  0.0  0.0 1325528 10272 ?       S    Sep12   0:00  \_ php-fpm: pool php70-www
root      8926  0.0  0.0 1205708 8420 ?        S<s  Sep12   0:00 php-fpm: master process (/usr/local/etc/php-fpm.conf)