Java başlangıç, AIX7.1

Question

AIX 64 bit çok yavaş 7G RAM

$ uname -a 
AIX server3 1 7 00036073D600 

$ java -version 
java version "1.6.0" 
Java(TM) SE Runtime Environment (build pap6460_26sr1-20111114_01(SR1)) 
IBM J9 VM (build 2.6, JRE 1.6.0 AIX ppc64-64 20111113_94967 (JIT enabled, AOT enabled) 
J9VM - R26_Java626_SR1_20111113_1649_B94967 
JIT - r11_20111028_21230 
GC - R26_Java626_SR1_20111113_1649_B94967 
J9CL - 20111113_94967) 
JCL - 20111112_01 

$ time /opt/IBM/WebSphere/AppServer/java/bin/java 
... 
real 0m40.62s 
user 0m0.43s 
sys  0m0.04s 

O herhangi bir uygulama olmadan java komutu başlatmak için 40s alır. JRE (64bit), WebSphere V8'in bir parçasıdır ve 20 dakikaya ihtiyaç duyar. Uygulama Sunucusunu başlatmak için

Aynı AIX'de başka bir JRE (32bit) var, çok iyi çalışıyor.

$ /usr/java6/bin/java -version 
java version "1.6.0" 
Java(TM) SE Runtime Environment (build pap3260sr9fp2-20110627_03(SR9 FP2)) 
IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 AIX ppc-32 jvmap3260sr9-20110624_85526 (JIT enabled, AOT enabled) 
J9VM - 20110624_085526 
JIT - r9_20101028_17488ifx17 
GC - 20101027_AA) 
JCL - 20110530_01 

$ time /usr/java6/bin/java 
real 0m0.70s 
user 0m0.64s 
sys  0m0.05s 

Ben truss.When java uzun bir süre thread_tsleep() engellendiğinde, başlangıç ​​için gidiyor kullanarak bazı şeyi buldum. Niye ya? Nasıl düzeltilir? damgası

1.8662:  socket(2, 2, 0)     = 4 
1.8666:  _esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F38A8, 16, 0x0000000000000000) = 25 
3.8671:  thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
1.8669:  _poll(0x000001001012AA00, 1, 5000) = 0 
6.8705:  close(4)       = 0 
6.8710:  socket(2, 2, 0)     = 4 
6.8715:  _esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F38A8, 16, 0x0000000000000000) = 25 
8.8723:  thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
6.8720:  _poll(0x000001001012AA00, 1, 5000) = 0 
11.8726:  close(4)      = 0 
11.8729:  socket(2, 2, 0)     = 4 
11.8732:  _esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F38A8, 16, 0x0000000000000000) = 25 
13.8738:  thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
11.8736:  _poll(0x000001001012AA00, 1, 10000) = 0 
21.8741:  close(4)      = 0 
21.8744:  socket(2, 2, 0)     = 4 
21.8748:  _esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F38A8, 16, 0x0000000000000000) = 25 
23.8754:  thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
21.8752:  _poll(0x000001001012AA00, 1, 20000) = 0 
41.8756:  close(4)      = 0 
41.8760:  getdomainname(0x000001001012CD10, 256) = 0 
41.8763:  kopen("/etc/hosts", O_RDONLY) = 4 
41.8767:  kioctl(4, 22528, 0x0000000000000000, 0x0000000000000000) Err#25 ENOTTY 
41.8770:  kfcntl(4, F_SETFD, 0x0000000000000001) = 0 
41.8773:  kioctl(4, 22528, 0x0000000000000000, 0x0000000000000000) Err#25 ENOTTY 
kread(0x0000000000000004, 0x0000010010416618, 0x0000000000001000) = 0x00000000000007B0 
    0x00000000: " # = = = = = = = = = =".. 
kread(0x0000000000000004, 0x0000010010416618, 0x0000000000001000) = 0x0000000000000000 
    0x00000000: " # = = = = = = = = = =".. 
41.8782:  close(4)      = 0 

tp

Quit in sem_wait at 0x9000000002632d8 ($t3) 
0x9000000002632d8 (sem_wait+0x98) e8410028   ld r2,0x28(r1) 

thread state-k  wchan   state-u k-tid mode held scope function 
>$t1  run       blocked 31391751 u no sys _event_sleep 
_event_sleep(??, ??, ??, ??, ??, ??) at 0x9000000008365c4 
_event_wait(??, ??) at 0x900000000837064 
_cond_wait_local(??, ??, ??) at 0x90000000084521c 
_cond_wait(??, ??, ??) at 0x900000000845808 
pthread_join(??, ??) at 0x90000000082d2b0 
unnamed block in ContinueInNewThread(continuation = 0x6c6f636b6c002e66, stack_size = 7310577395057127012, args = 0x5f6f72002e666574), line 2286 in "java_md.c" 
ContinueInNewThread(continuation = 0x6c6f636b6c002e66, stack_size = 7310577395057127012, args = 0x5f6f72002e666574), line 2286 in "java_md.c" 
unnamed block in main(argc = 0, argv = 0x000001001000c178), line 532 in "java.c" 
main(argc = 0, argv = 0x000001001000c178), line 532 in "java.c" 

thread state-k  wchan   state-u k-tid mode held scope function 
>$t2  run       running 54329549 u no sys __fd_poll 
__fd_poll(??, ??, ??) at 0x90000000012c0d4 
res_send.poll(??, ??, ??) at 0x9000000001021ac 
res_nsend(0x100103f37a8, 0x1001012b860, 0x1900000019, 0x1001012cbb0, 0x40000000400) at 0x9000000001011d4 
res_nquery(??, ??, ??, ??, ??, ??) at 0x90000000012b5d8 
res_nquerydomain(??, ??, ??, ??, ??, ??, ??) at 0x90000000012ab14 
res_nsearch(??, ??, ??, ??, ??, ??) at 0x90000000012af08 
res_search(??, ??, ??, ??, ??) at 0x900000000107b50 
dns_ho.ho_byname2(??, ??, ??) at 0x90000000013a384 
gen_ho.ho_byname2(??, ??, ??) at 0x900000000163888 
gethostbyname2(??, ??) at 0x9000000001060ec 
getaddrinfo2(??, ??, ??, ??, ??) at 0x900000000102ba0 
getaddrinfo(??, ??, ??, ??) at 0x900000000104d34 
j9sock_getaddrinfo() at 0x9000000053caad8 
populateRASNetData() at 0x900000005347fc0 
VMInitStages() at 0x9000000053086b0 
runJ9VMDllMain() at 0x90000000530bb9c 
pool.pool_do() at 0x9000000052f29c8 
runInitializationStage() at 0x90000000530b890 
protectedInitializeJavaVM() at 0x900000005306478 
j9sig_protect() at 0x9000000053a2b9c 
initializeJavaVM() at 0x90000000530585c 
jniinv.JNI_CreateJavaVM() at 0x90000000530ea14 
jvm.JNI_CreateJavaVM() at 0x900000000ccc510 
redirector.JNI_CreateJavaVM() at 0x900000000cb5574 
InitializeJVM(pvm = (nil), penv = (nil), ifn = (nil)), line 1801 in "java.c" 
main(argc = 0, argv = (nil)), line 810 in "java.c" 

thread state-k  wchan   state-u k-tid mode held scope function 
>$t3  run       running 52887625 k no sys sem_wait 
sem_wait(??) at 0x9000000002632d8 
asynchSignalReporter() at 0x9000000053a3dcc 
thread_wrapper() at 0x900000000d00ad0 

!!!! ThreadDump Completed- detached from debugger !!!! 

Güncelleme

ile

kopen("/etc/irs.conf", O_RDONLY)    Err#2 ENOENT 
_thread_self()         = 26738737 
getdomainname(0x09001000A00E44F8, 1024)   = 0 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
getdomainname(0x09001000A00E44F8, 1024)   = 0 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
kopen("/etc/hesiod.conf", O_RDONLY)    Err#2 ENOENT 
_thread_self()         = 26738737 
getdomainname(0x09001000A00E44F8, 1024)   = 0 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
getdomainname(0x09001000A00E44F8, 1024)   = 0 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
getdomainname(0x09001000A00E44F8, 1024)   = 0 
_thread_self()         = 26738737 
_thread_self()         = 26738737 
socket(2, 2, 0)         = 4 
getsockopt(4, 65535, 4104, 0x000001001012A934, 0x000001001012A930) = 0 
connext(4, 0x00000100103F37B8, 16)    = 0 
_esend(4, 0x000001001012B860, 40, 0, 0x0000000000000000) = 40 
_poll(0x000001001012AA00, 1, 5000)    = 1 
_enrecvfrom(4, 0x000001001012CBB0, 1024, 0, 0x000001001012B1C0, 0x000001001012A9E8, 0x0000000000000000) = 56 
close(4)          = 0 
socket(2, 2, 0)         = 4 
getsockopt(4, 65535, 4104, 0x000001001012A934, 0x000001001012A930) = 0 
connext(4, 0x00000100103F37B8, 16)    = 0 
_esend(4, 0x000001001012B860, 40, 0, 0x0000000000000000) = 40 
_poll(0x000001001012AA00, 1, 5000)    = 1 
_enrecvfrom(4, 0x000001001012CBB0, 1024, 0, 0x000001001012B1C0, 0x000001001012A9E8, 0x0000000000000000) = 94 
_esend(4, 0x000001001012B860, 25, 0, 0x0000000000000000) = 25 
_poll(0x000001001012AA00, 1, 5000)    = 1 
_enrecvfrom(4, 0x000001001012CBB0, 1024, 0, 0x000001001012B1C0, 0x000001001012A9E8, 0x0000000000000000) = 25 
close(4)          = 0 
socket(2, 2, 0)         = 4 
_esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F37C8, 16, 0x0000000000000000) = 25 
thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
_poll(0x000001001012AA00, 1, 5000)    = 0 
close(4)          = 0 
socket(2, 2, 0)         = 4 
_esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F37C8, 16, 0x0000000000000000) = 25 
thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
_poll(0x000001001012AA00, 1, 5000)    = 0 
close(4)          = 0 
socket(2, 2, 0)         = 4 
_esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F37C8, 16, 0x0000000000000000) = 25 
thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
_poll(0x000001001012AA00, 1, 10000)    = 0 
close(4)          = 0 
socket(2, 2, 0)         = 4 
_esendto(4, 0x000001001012B860, 25, 0, 0x00000100103F37C8, 16, 0x0000000000000000) = 25 
thread_tsleep(0, 0x09001000A030F400, 0x0000000000000000, 0x0000000000000000) (sleeping...) 
_poll(0x000001001012AA00, 1, 20000)    = 0 
close(4)          = 0 
getdomainname(0x000001001012CD10, 256)   = 0 
kopen("/etc/hosts", O_RDONLY)     = 4 
kioctl(4, 22528, 0x0000000000000000, 0x0000000000000000) Err#25 ENOTTY 
kfcntl(4, F_SETFD, 0x0000000000000001)   = 0 
kioctl(4, 22528, 0x0000000000000000, 0x0000000000000000) Err#25 ENOTTY 
kread(0x0000000000000004, 0x0000010010416538, 0x0000000000001000) = 0x00000000000007B0 
    0x00000000: " # = = = = = = = = = =".. 
kread(0x0000000000000004, 0x0000010010416538, 0x0000000000001000) = 0x0000000000000000 
    0x00000000: " # = = = = = = = = = =".. 
close(4)          = 0 
__libc_sbrk(0x0000000000020020)     = 0x0000010010421C20 

Ben bu konuyu buldum ve benim AIX üzerinde programını test edin. Ana bilgisayar adını kullanırken, DNS sorgusu için yaklaşık 40s gecikti. IP Adresi normaldir. Adını ping zaman arada

Java cannot resolve DNS address from AIX: UnknownHostException

, ana makine adı Server3 gösterir, gösterir: PING server3.cf1.xx.xxxx.com ..... Ben Server3 kullanarak programı çalıştırmak .cf1.xx.xxxx.com, gecikme yok.

Update2:

Bu IPV6 sorundur. -Djava.net.preferIPv4Stack = true eklerseniz, java uygulaması iyi çalışır. Ancak java komutu hala DNS sorgulamak için IPV6 kullanıyor. Bu yüzden java komutunun 40'lı gecikme süresi vardır ve java uygulamasının DNS sorgusunda hiçbir deliği yoktur.

Varsayılan protokolü java parametresi değil AIX'de IPV4 olarak ayarlayabilir miyim?

Answer 1

Makas çıkışınızdan neyin uzun sürdüğünü anlamak zor (belki de çıkışına zaman damgası ekleyebilirseniz bakın, bence bu truss bunu yapabilir), ancak çok sayıda getdomainname etkinliği var, her zaman tuhaf başlangıç ​​gecikmelerini araştırırken baş şüpheli. Bu kutuya atanan geçersiz bir ana makine adı olup olmadığını kontrol edin, birincil ana makine adının/etc/hosts içinde 127.0.0.1 olarak çözüldüğünden emin olun.

Answer 2

Bu konuda% 100 emin değilim, ama en azından bir cami var: 64 bit VM IPv6 kullanırken,

AIX üzerinde

, 32 bit Java VM varsayılan IP protokolü olarak IPv4 kullanır. İşletim sisteminde IPv6 etkinleştirilmiş, ancak yanlış yapılandırılmışsa, 64 bit VM, ağ zaman aşımlarını beklediği farklı noktalarda asılı kalabilir. Bu, analizinizi makasla eşleştiriyor gibi görünüyor.

Sen java komutuna aşağıdaki seçeneği ekleyerek tercih ağ yığını olarak IPv4 ile 64 bit VM başlatmak için deneyebilirsiniz

: -Djava.net.preferIPv4Stack = true

Answer 3

Anladın mı.

Bu sorunu gidermek /etc/netsvc.conf dosyasına aşağıdaki satırı ekleyerek IPV6 aramalarını devre dışı bırakmak için:

barındıran = local4, bind4

Referans: Client on AIX generates excessive IPV6 DNS lookups for new connections