jstat get this:
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT
64512.0 68096.0 46476.6 0.0 535552.0 125004.4 154624.0 106045.5 29184.0 28595.3 12 0.620 1 0.200 0.820
now i use the comand ./jinfo -flag PermSize 8216get the output:
-XX:PermSize=21757952
and with ./jinfo -flag MaxPermSize 8216 get:
-XX:MaxPermSize=85983232
About jstat i find the message at oracle docs:
In my opinion,PC and the PermSize are the same.Obviously,that`s wrong.How should I understand the difference between PC and MaxPermSize?
On my server,there will be a permanent generation of OOM anomalies occasionally and what do i need to do to expand the capacity of PC?
This is a log fragment:
17-Nov-2017 14:57:24.681 信息 [main] org.apache.catalina.startup.Catalina.start Server startup in 53059 ms
start...
17-Nov-2017 14:58:05.202 严重 [pool-20-thread-1] org.springframework.scheduling.support.TaskUtils$LoggingErrorHandler.handleError Unexpected error occurred in scheduled task.
java.lang.OutOfMemoryError: PermGen space
at sun.security.ssl.SSLContextImpl.getApplicableCipherSuiteList(SSLContextImpl.java:362)
at sun.security.ssl.SSLContextImpl.getDefaultCipherSuiteList(SSLContextImpl.java:296)
at sun.security.ssl.SSLSocketImpl.init(SSLSocketImpl.java:583)
at sun.security.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:518)
at sun.security.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:73)
at sun.net.www.protocol.https.HttpsClient.createSocket(HttpsClient.java:409)
at sun.net.NetworkClient.doConnect(NetworkClient.java:162)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1092)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)
at com.inspur.email.data.netapi.ApiJsonPuller.sendDataToBaiduApi(ApiJsonPuller.java:170)
at com.inspur.email.data.netapi.ApiJsonPuller.getTrendJson(ApiJsonPuller.java:121)
at com.inspur.email.data.manager.ProductReport.getReportApiData(ProductReport.java:58)
at com.inspur.email.producer.ReportEmailProducer.getReportEmail(ReportEmailProducer.java:56)
at com.inspur.email.manager.MailSendService.createReportEmail(MailSendService.java:82)
at com.inspur.email.manager.MailSendService.sendReport(MailSendService.java:63)
at com.inspur.email.controller.MailSendTimeController.startReport(MailSendTimeController.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:64)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:53)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
use jmap get the output:
Attaching to process ID 8216, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 24.79-b02
using thread-local object allocation.
Parallel GC with 4 thread(s)
Heap Configuration:
MinHeapFreeRatio = 0
MaxHeapFreeRatio = 100
MaxHeapSize = 2063597568 (1968.0MB)
NewSize = 1310720 (1.25MB)
MaxNewSize = 17592186044415 MB
OldSize = 5439488 (5.1875MB)
NewRatio = 2
SurvivorRatio = 8
PermSize = 21757952 (20.75MB)
MaxPermSize = 85983232 (82.0MB)
G1HeapRegionSize = 0 (0.0MB)
Heap Usage:
PS Young Generation
Eden Space:
capacity = 548405248 (523.0MB)
used = 548405248 (523.0MB)
free = 0 (0.0MB)
100.0% used
From Space:
capacity = 66060288 (63.0MB)
used = 47592088 (45.387351989746094MB)
free = 18468200 (17.612648010253906MB)
72.04341585673983% used
To Space:
capacity = 69730304 (66.5MB)
used = 0 (0.0MB)
free = 69730304 (66.5MB)
0.0% used
PS Old Generation
capacity = 158334976 (151.0MB)
used = 108590592 (103.56005859375MB)
free = 49744384 (47.43994140625MB)
68.5828202607616% used
PS Perm Generation
capacity = 29884416 (28.5MB)
used = 29322992 (27.964584350585938MB)
free = 561424 (0.5354156494140625MB)
98.12134859854714% used
the MaxPermSize is 82.0MB,the PC is 28M,so Why OOM occurs?