How to check number of CPUs are there in Linux system

One can use any one of the following command to find the number of physical CPU cores including all cores on Linux:

  • lscpu command
  • cat /proc/cpuinfo
  • top or htop command
  • nproc command


Just run the lscpu command:

$ lscpu
$ lscpu | egrep 'Model name|Socket|Thread|NUMA|CPU\(s\)'
$ lscpu -p[root@shsdascn7i ~]# lscpuArchitecture:          x86_64CPU op-mode(s):        32-bit, 64-bitByte Order:            Little EndianCPU(s):                2On-line CPU(s) list:   0,1Thread(s) per core:    1Core(s) per socket:    1Socket(s):             2NUMA node(s):          1Vendor ID:             GenuineIntelCPU family:            6Model:                 158Model name:            Intel(R) Core(TM) i7-8700 CPU @ 3.20GHzStepping:              10CPU MHz:               3191.998CPU max MHz:           0.0000CPU min MHz:           0.0000BogoMIPS:              6383.99Hypervisor vendor:     VMwareVirtualization type:   fullL1d cache:             32KL1i cache:             32KL2 cache:              256KL3 cache:              12288KNUMA node0 CPU(s):     0,1Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf 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 epb fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp

The following line indicates that I have two physical CPUs:

CPU socket(s):         2
cat /proc/cpuinfo
OR
$ more /proc/cpuinfo[root@shsdascn7i ~]# cat /proc/cpuinfoprocessor       : 0vendor_id       : GenuineIntelcpu family      : 6model           : 158model name      : Intel(R) Core(TM) i7-8700 CPU @ 3.20GHzstepping        : 10microcode       : 0xb4cpu MHz         : 3191.998cache size      : 12288 KBphysical id     : 0siblings        : 1core id         : 0cpu cores       : 1apicid          : 0initial apicid  : 0fpu             : yesfpu_exception   : yescpuid level     : 22wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf 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 epb fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_eppbogomips        : 6383.99clflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:
processor       : 1vendor_id       : GenuineIntelcpu family      : 6model           : 158model name      : Intel(R) Core(TM) i7-8700 CPU @ 3.20GHzstepping        : 10microcode       : 0xb4cpu MHz         : 3191.998cache size      : 12288 KBphysical id     : 2siblings        : 1core id         : 0cpu cores       : 1apicid          : 2initial apicid  : 2fpu             : yesfpu_exception   : yescpuid level     : 22wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf 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 epb fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_eppbogomips        : 6383.99clflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:

Let us print cpu thread count:
$ echo "CPU threads: $(grep -c processor /proc/cpuinfo)"
$ grep 'cpu cores' /proc/cpuinfo | uniq
top - 15:54:25 up 9 days, 23:17,  2 users,  load average: 3.79, 2.87, 2.32Tasks: 491 total,   1 running, 490 sleeping,   0 stopped,   0 zombie%Cpu(s):  4.1 us,  6.0 sy,  0.0 ni, 29.1 id, 60.5 wa,  0.0 hi,  0.3 si,  0.0 stKiB Mem :  9810952 total,   133368 free,  7078720 used,  2598864 buff/cacheKiB Swap: 12697596 total, 10402480 free,  2295116 used.   794624 avail Mem
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND 12341 apdascn+  20   0 1474108  81472   3028 S  16.9  0.8   0:39.14 java 28754 ordascn+  -2   0 2564436   2276   1876 S   1.3  0.0 293:00.05 ora_vktm_cdbebs    35 root      20   0       0      0      0 S   1.0  0.0   7:00.63 kswapd0 95348 apdascn+  20   0 2841624 751960      0 S   0.7  7.7   4:30.52 java     9 root      20   0       0      0      0 S   0.3  0.0   6:04.69 rcu_sched  9661 root      20   0       0      0      0 S   0.3  0.0   1:41.58 jbd2/sdd1-8  9673 root      20   0       0      0      0 S   0.3  0.0   1:55.88 jbd2/sdc1-8 10467 root      20   0       0      0      0 S   0.3  0.0   0:00.56 kworker/0:0 12186 apdascn+  20   0 1856860 290032    484 S   0.3  3.0   0:07.77 java 12524 root      20   0  162308   2660   1560 R   0.3  0.0   0:00.13 top 28770 ordascn+  20   0 2672080  31740  27912 S   0.3  0.3   4:42.92 ora_scmn_cdbebs 28802 ordascn+  20   0 2564440  35232  34200 S   0.3  0.4   5:37.36 ora_ckpt_cdbebs 97935 apdascn+  20   0 1754184 136872   1632 S   0.3  1.4   0:35.74 java 99473 apdascn+  20   0 2312444 865848      0 S   0.3  8.8   3:20.05 java117218 ordascn+  20   0 2568340 195068 189264 S   0.3  2.0   0:06.54 ora_m008_cdbebs     1 root      20   0  195224   3040    596 S   0.0  0.0   0:32.65 systemd     2 root      20   0       0      0      0 S   0.0  0.0   0:00.63 kthreadd     3 root      20   0       0      0      0 S   0.0  0.0   1:32.14 ksoftirqd/0     5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H     7 root      rt   0       0      0      0 S   0.0  0.0   0:01.99 migration/0     8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh    10 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 lru-add-drain    11 root      rt   0       0      0      0 S   0.0  0.0   0:15.58 watchdog/0

Another option is to run lovely htop:
$ htop
Execute nproc print the number of CPUs available on Linux
Let us print the number of installed processors on your system i.e core count:
$ nproc --all
$ echo "Threads/core: $(nproc --all)"
Sample outputs:
[root@shsdascn7i ~]# echo "Threads/core: $(nproc --all)"
Threads/core: 2

Comments

Post a Comment

Popular posts from this blog

How to fix Oracle SQL Developer connection issue "Got minus one from a read call"

Image
 During connection from SQL Developer to EBS database got below error message: Status : Failure - Test failed: IO Error: Got minus one from a read call Following solution can be done : 1. Go to directory $ORACLE_HOME / network / admin 2. Modify sqlnet.ora file with following parameter : tcp.validnode_checking = no 3. If you don 't want to disable this, you can put the machine names as follows: tcp.invited_nodes=(machine1, machine2) 3. Bounce the listener. Due to security enhancements it is not good to put tcp.validnode_checking = no or comment out will through error when we start listener like below: Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=shsebs7idb1.appsolworld.com)(PORT=1522))) TNS-00584: Valid node checking configuration error TNS-12560: TNS:protocol adapter error Better plan is to add localhost or IP address of client (Local Computer) in the sqlnet.ora file That will solve the problem NAMES.DIRECTORY_PATH=(TNSNAMES, ONAMES, HOSTNAME) SQLNET.EXPI
Read more

How to drop index and before dropping it how to get the DDL.

  Oracle DROP INDEX statement DROP INDEX [schema_name.]index_name; DECLARE index_count INTEGER; BEGIN SELECT COUNT(*) INTO index_count FROM USER_INDEXES WHERE INDEX_NAME = 'index_name' ; IF index_count > 0 THEN EXECUTE IMMEDIATE 'DROP INDEX index_name' ; END IF; END; / In case want to check whether index exists and then delete it. If try to drop a non-existing, you will get the following error: SQL Error : ORA -01418 : specified index does not exist In SQLplus, set these before running the commands set long 100000 set longchunksize 100000 select DBMS_METADATA.GET_DDL( 'INDEX' , 'index_name') from all_indexes where owner in ( USER , 'USER_OTHER_THAN_LOGGED_IN_USER' ); Use below script to fetch metadata other information. SELECT DBMS_METADATA,GET_GRANTED_DDL('SYSTEM_GRANT','SSO******') from dual;
Read more

How to troubleshoot Long Running Concurrent Request in EBS 12.2

 The following points need to answer before jumping into troubleshooting: Are there any recent code changes done in the concurrent program?           Check long_running_sid and verify the recent code change of last_ddl_timestamp after a             discussion with the developer. Was this running long in the last few run as well, or was this time only?            ==> Check the program history. How much time does it take to complete?           Once again program history can give us some idea. Are these jobs fetching higher data compared to the last run           ===> Confirm on data change . Query Plan change will indicate this issue. Does this job runs at any specific time or it can be run anytime           ===> The nature of the job can help to understand the job's nature. Does this job fetch data using DB Link          ====> Check whether the DB link is involved or not. The below-given approach would help to conclude the gray areas. Check the load of the server using t
Read more

How to autopopulate user_guid in fnd_user table ( EBS Blank Page)

  Issue:  EBS Local Login url is working fine. When accessing sso url, users are getting error as below appended to the url. And login page will be blank. One of the reason could be : OAM Authentication is fine but during authorization process, OAM is unable to map guid from oid to user_guid in fnd_user. This can be due to user_guid being null in fnd_user table. As per the process, when user logins for the first time, user_guid need to be populated automatically (from oid) Query guid from oid and update fnd_user table with that. ldapsearch -h oidhost.appsolworld.com -p 3060 -D "cn=orcladmin" -w orcladmpwd -b "cn=Users,dc=dc,dc=online,dc=org" -s sub "(uid=$1)" orclsamaccountname krbprincipalname mail orcluserprincipalname orclguid Pass userid to this command which gives guid along with other details. Update fnd_user table with above guid : update fnd_user  set user_guid=' ' where user_name like ' '; Solution:  As per the process,  when user
Read more

Opatch is getting faild for GI patch with error code 2 while doing prereq

OPatch failed with error code 2  When checked the patch conflict for a patch, got below error. ]$opatch prereq CheckConflictAgainstOHWithDetail -ph ./ Oracle Interim Patch Installer version 12.2.0.1.29 Copyright (c) 2020, Oracle Corporation.  All rights reserved. PREREQ session Oracle Home       : /u01/oracle/product/19.0.0.0 Central Inventory : /u01/oracle/oraInventory    from           : /u01/oracle/product/19.0.0.0/oraInst.loc OPatch version    : 12.2.0.1.29 OUI version       : 12.2.0.1.4 Log file location : /oragrid/orahome/product/19.3.0/cfgtoollogs/opatchauto/core/opatch/opatch2023-12-22_09-37-15AM_1.log Invoking prereq "checkconflictagainstohwithdetail" Prereq "checkConflictAgainstOHWithDetail" is not executed. The details are: Unable to create Patch Object. Exception occured : /orastage/OCT23_GRID_CPU/35642822/33575402/etc/config/actions.xml with Version field of the component "delete" in actions file cannot be <null> or empty. Please check p
Read more

Few Important steps of Oracle Database Clone

 Make Sure oraInst.loc location is correct and accessble. [demantra@dsiddem ~]$ cat /etc/oraInst.loc inventory_loc=/orastage/oraInventory inst_group=dba [demantra@dsiddem ~]$ cd /orastage/oraInventory [demantra@dsiddem oraInventory]$ ls -ltr total 16 drwxrwx---. 5 demantra dba 4096 Jul 22 19:37 backup drwxrwx---. 2 demantra dba 4096 Jul 22 19:37 ContentsXML drwxrwx---. 2 demantra dba 4096 Jul 22 19:37 locks drwxrwx---. 3 demantra dba 4096 Jul 23 10:08 logs Remove Oracle Home from Inventory [demantra@dsiddem oraInventory]$ cd $ORACLE_HOME/oui/bin [demantra@dsiddem bin]$ ./runInstaller -detachHome ORACLE_HOME=$ORACLE_HOME Starting Oracle Universal Installer... Checking swap space: must be greater than 500 MB.   Actual 3039 MB    Passed The inventory pointer is located at /etc/oraInst.loc Run Clone.pl [demantra@dsiddem bin]$ echo $ORACLE_HOME /dnbsid/demantra/oracle/19.0.0 [demantra@dsiddem bin]$ echo $ORACLE_BASE /dnbsid/demantra [demantra@dsiddem bin]$ E01=ORACLE_HOME=$ORACLE_HOME [dema
Read more

How to Check AD and TXK code levels in your EBS environment

Below query can be used in finding out current AD and TXK code levels.  [ap******@shsd*** 22989949]$ sqlplus apps SQL*Plus: Release 10.1.0.5.0 - Production on Fri Sep 30 01:00:25 2022 Copyright (c) 1982, 2005, Oracle.  All rights reserved. Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production SQL> col ABBREVIATION for a10 set lines 1000 col NAME for a50 col CODELEVEL for a20 SELECT ABBREVIATION,NAME,codelevel FROM AD_TRACKABLE_ENTITIES WHERE abbreviation in ('txk','ad');SQL> SQL> SQL> SQL> ABBREVIATI NAME                                               CODELEVEL ---------- -------------------------------------------------- -------------------- ad         Oracle Applications DBA                            C.13 txk        Oracle Applications Technology Stack               C.13 Check fwk in r12.2 select abbreviation ,codelevel from ad_trackable_entities where abbreviation in( 'fwk') order by abbreviation; SELECT codelevel
Read more

The Server is not able to service this request: [Socket:000445]Connection rejected, filter blocked Socket, weblogic.security.net.FilterException

Image
  Connection Filters allow one to deny access to UNWANTED Connections at the network level. Connection Filters can be used to protect server resources on individual servers, server clusters, or an entire internal network or Intranet. Connection filters are particularly useful when using the Administration port. Depending on the network firewall configuration, it may be possible to use a connection filter to further restrict administration access. A typical use might be to restrict access to the Administration port to only the servers and machines in the domain. WebLogic Server provides a default connection filter called  weblogic.security.net.ConnectionFilterImpl . This default connection filter accepts all incoming connections except the ones defined in the Administration Console as a Connection filter rule. Custom connection filters may be written  by implementing the classes in the weblogic.security.net package. This post will demonstrate the steps to configure Weblogic Connection F
Read more

CPU Patch Analysis

 Oracle CPU patch analysis Identifying the Latest Critical Patch Update for Oracle E-Business Suite Release 12.2 (Doc ID 2484000.1) Database Quick-Link If you only care about the database patches, this MOS note steps you through really easily. Assistant: Download Reference for Oracle Database/GI Update, Revision, PSU, SPU(CPU), Bundle Patches, Patch sets and Base Releases (Doc ID 2118136.2) https://www.oracle.com/security-alerts/ Critical Patch Updates Critical Patch Updates provide security patches for supported Oracle on-premises products. They are available to customers with valid support contracts. Starting in April 2022, Critical Patch Updates are released on the third Tuesday of January, April, July, and October (They were previously published on the Tuesday closest to the 17th day of January, April, July, and October). The next four dates are: 16 April 2024 16 July 2024 15 October 2024 21 January 2025 A pre-release announcement will be published on the Thursday preceding each Cr
Read more

PRVG-11250 : The check "RPM Package Manager database" was not performed because

Following message reported from cluvfy while performing pre-requisite for Clusterware Installation:  Verifying RPM Package Manager database ...INFORMATION PRVG-11250 : The check "RPM Package Manager database" was not performed because it needs 'root' user privileges. SOLUTION Execute runcluvfy manually with "-method root" option and enter root password when prompted : Example: $/runcluvfy.sh stage -pre crsinst -n <HOSTNAME1>,<HOSTNAME2> -method root Enter "ROOT" password: For reference metalink doc id :  2548970.1
Read more