Shulou(Shulou.com)05/31 Report--

This article will explain in detail the differences between jdk1.8u131 and jdk1.8u222 cpu acquisition methods. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

How to get the cpu of JDK1.8u222

Int OSContainer::active_processor_count () {

Int quota_count = 0, share_count = 0

Int cpu_count, limit_count

Int result

Cpu_count = limit_count = os::Linux::active_processor_count ()

Int quota = cpu_quota ()

Int period = cpu_period ()

Int share = cpu_shares ()

If (quota >-1 & & period > 0) {

Quota_count = ceilf ((float) quota / (float) period)

If (PrintContainerInfo) {

Tty- > print_cr ("CPU Quota count based on quota/period:% d", quota_count)

}

}

If (share >-1) {

Share_count = ceilf ((float) share / (float) PER_CPU_SHARES)

If (PrintContainerInfo) {

Tty- > print_cr ("CPU Share count based on shares:% d", share_count)

}

}

/ / If both shares and quotas are setup results depend

/ / on flag PreferContainerQuotaForCPUCount.

/ / If true, limit CPU count to quota

/ / If false, use minimum of shares and quotas

If (quota_count! = 0 & & share_count! = 0) {

If (PreferContainerQuotaForCPUCount) {

Limit_count = quota_count

} else {

Limit_count = MIN2 (quota_count, share_count)

}

} else if (quota_count! = 0) {

Limit_count = quota_count

} else if (share_count! = 0) {

Limit_count = share_count

}

Result = MIN2 (cpu_count, limit_count)

If (PrintContainerInfo) {

Tty- > print_cr ("OSContainer::active_processor_count:% d", result)

}

Return result

}

How to get the cpu of JDK1.8u131

Int os::active_processor_count () {

/ / Linux doesn't yet have a (official) notion of processor sets

/ / so just return the number of online processors.

Int online_cpus =:: sysconf (_ SC_NPROCESSORS_ONLN)

Assert (online_cpus > 0 & & online_cpus

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