Tuning Garbage Collection in Apache Tomcat Announcing the arrival of Valued Associate #679:...
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Tuning Garbage Collection in Apache Tomcat
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
Come Celebrate our 10 Year Anniversary!reloadable = true tomcatUnusual Apache->Tomcat caching issueApache 2.2 with TomcatTomcat hangs when enabling tomcat-users.xmlCannot shutdown Tomcat - transport Errortomcat, jvm, monitoring, restartingReplacing Apache instance with Tomcat 6Amazon EC2 - Free memoryApache tomcat is not restartingConnections pending Apache + Tomcat Setup
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I have the following parameters in tomcat6.conf
JAVA_OPTS="-server -Xmx6144m -Xms3072m -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=999 -XX:ReservedCodeCacheSize=128m -XX:MaxPermSize=256m -Djava.awt.headless=true -Dcom.sun.management.jmxremote=true -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname= -Djava.rmi.server.useLocalHostname=false"
but at peak time I see the following regularly,
ERROR memory-watcher - used 87.73865761212004%, max 6403194880 reaping at priority CRITICAL
is there any parameter I can use to to tune tomcat performance or GC ?
tomcat6
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
bumped to the homepage by Community♦ 7 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have the following parameters in tomcat6.conf
JAVA_OPTS="-server -Xmx6144m -Xms3072m -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=999 -XX:ReservedCodeCacheSize=128m -XX:MaxPermSize=256m -Djava.awt.headless=true -Dcom.sun.management.jmxremote=true -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname= -Djava.rmi.server.useLocalHostname=false"
but at peak time I see the following regularly,
ERROR memory-watcher - used 87.73865761212004%, max 6403194880 reaping at priority CRITICAL
is there any parameter I can use to to tune tomcat performance or GC ?
tomcat6
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
bumped to the homepage by Community♦ 7 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have the following parameters in tomcat6.conf
JAVA_OPTS="-server -Xmx6144m -Xms3072m -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=999 -XX:ReservedCodeCacheSize=128m -XX:MaxPermSize=256m -Djava.awt.headless=true -Dcom.sun.management.jmxremote=true -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname= -Djava.rmi.server.useLocalHostname=false"
but at peak time I see the following regularly,
ERROR memory-watcher - used 87.73865761212004%, max 6403194880 reaping at priority CRITICAL
is there any parameter I can use to to tune tomcat performance or GC ?
tomcat6
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
I have the following parameters in tomcat6.conf
JAVA_OPTS="-server -Xmx6144m -Xms3072m -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=999 -XX:ReservedCodeCacheSize=128m -XX:MaxPermSize=256m -Djava.awt.headless=true -Dcom.sun.management.jmxremote=true -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname= -Djava.rmi.server.useLocalHostname=false"
but at peak time I see the following regularly,
ERROR memory-watcher - used 87.73865761212004%, max 6403194880 reaping at priority CRITICAL
is there any parameter I can use to to tune tomcat performance or GC ?
tomcat6
tomcat6
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
edited Aug 15 '13 at 22:00
arashsami
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
asked Jul 11 '13 at 11:21
arashsamiarashsami
136
136
bumped to the homepage by Community♦ 7 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 7 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
add a comment |
1 Answer
1
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The "-Xms3072m" and "-Xmx6144m" bits are where you're configuring your starting heap size and your max heap, respectively.
This is distinct from the "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" bits, where you set up the generation memory (where the JVM stores classes, rather than the heap where it stores objects). One thing I notice here is that the sizes are different. Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection.
You might also want to try "-XX:+UseParallelGC" instead of "-XX:+UseConcMarkSweepGC"...Usually if I have problems with one, then I have better luck with the other.
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
Thanks for this, you know where you said "Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection." Do you means the size of "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" should be the same ?
– arashsami
Jul 11 '13 at 17:03
I think he means make your minimum and maximum heap sizes the same e.g. "-Xms6144m -Xmx6144m".
– Fred Clausen
Jul 12 '13 at 7:09
OMG NO! If someone tells you this a good idea, then they 1) they are probably wrong or 2) there are whole lot of qualifications of when this is a good idea which you've forgotten about
– symcbean
Dec 28 '17 at 14:22
Arguably, if setting max and min heap sizes identically avoids some kind of problem you should really fix that problem instead.
– Spooler
Feb 28 '18 at 23:40
add a comment |
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The "-Xms3072m" and "-Xmx6144m" bits are where you're configuring your starting heap size and your max heap, respectively.
This is distinct from the "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" bits, where you set up the generation memory (where the JVM stores classes, rather than the heap where it stores objects). One thing I notice here is that the sizes are different. Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection.
You might also want to try "-XX:+UseParallelGC" instead of "-XX:+UseConcMarkSweepGC"...Usually if I have problems with one, then I have better luck with the other.
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
Thanks for this, you know where you said "Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection." Do you means the size of "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" should be the same ?
– arashsami
Jul 11 '13 at 17:03
I think he means make your minimum and maximum heap sizes the same e.g. "-Xms6144m -Xmx6144m".
– Fred Clausen
Jul 12 '13 at 7:09
OMG NO! If someone tells you this a good idea, then they 1) they are probably wrong or 2) there are whole lot of qualifications of when this is a good idea which you've forgotten about
– symcbean
Dec 28 '17 at 14:22
Arguably, if setting max and min heap sizes identically avoids some kind of problem you should really fix that problem instead.
– Spooler
Feb 28 '18 at 23:40
add a comment |
The "-Xms3072m" and "-Xmx6144m" bits are where you're configuring your starting heap size and your max heap, respectively.
This is distinct from the "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" bits, where you set up the generation memory (where the JVM stores classes, rather than the heap where it stores objects). One thing I notice here is that the sizes are different. Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection.
You might also want to try "-XX:+UseParallelGC" instead of "-XX:+UseConcMarkSweepGC"...Usually if I have problems with one, then I have better luck with the other.
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
Thanks for this, you know where you said "Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection." Do you means the size of "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" should be the same ?
– arashsami
Jul 11 '13 at 17:03
I think he means make your minimum and maximum heap sizes the same e.g. "-Xms6144m -Xmx6144m".
– Fred Clausen
Jul 12 '13 at 7:09
OMG NO! If someone tells you this a good idea, then they 1) they are probably wrong or 2) there are whole lot of qualifications of when this is a good idea which you've forgotten about
– symcbean
Dec 28 '17 at 14:22
Arguably, if setting max and min heap sizes identically avoids some kind of problem you should really fix that problem instead.
– Spooler
Feb 28 '18 at 23:40
add a comment |
The "-Xms3072m" and "-Xmx6144m" bits are where you're configuring your starting heap size and your max heap, respectively.
This is distinct from the "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" bits, where you set up the generation memory (where the JVM stores classes, rather than the heap where it stores objects). One thing I notice here is that the sizes are different. Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection.
You might also want to try "-XX:+UseParallelGC" instead of "-XX:+UseConcMarkSweepGC"...Usually if I have problems with one, then I have better luck with the other.
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
The "-Xms3072m" and "-Xmx6144m" bits are where you're configuring your starting heap size and your max heap, respectively.
This is distinct from the "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" bits, where you set up the generation memory (where the JVM stores classes, rather than the heap where it stores objects). One thing I notice here is that the sizes are different. Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection.
You might also want to try "-XX:+UseParallelGC" instead of "-XX:+UseConcMarkSweepGC"...Usually if I have problems with one, then I have better luck with the other.
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
answered Jul 11 '13 at 11:51
SatanicpuppySatanicpuppy
5,53811217
5,53811217
Thanks for this, you know where you said "Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection." Do you means the size of "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" should be the same ?
– arashsami
Jul 11 '13 at 17:03
I think he means make your minimum and maximum heap sizes the same e.g. "-Xms6144m -Xmx6144m".
– Fred Clausen
Jul 12 '13 at 7:09
OMG NO! If someone tells you this a good idea, then they 1) they are probably wrong or 2) there are whole lot of qualifications of when this is a good idea which you've forgotten about
– symcbean
Dec 28 '17 at 14:22
Arguably, if setting max and min heap sizes identically avoids some kind of problem you should really fix that problem instead.
– Spooler
Feb 28 '18 at 23:40
add a comment |
Thanks for this, you know where you said "Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection." Do you means the size of "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" should be the same ?
– arashsami
Jul 11 '13 at 17:03
I think he means make your minimum and maximum heap sizes the same e.g. "-Xms6144m -Xmx6144m".
– Fred Clausen
Jul 12 '13 at 7:09
OMG NO! If someone tells you this a good idea, then they 1) they are probably wrong or 2) there are whole lot of qualifications of when this is a good idea which you've forgotten about
– symcbean
Dec 28 '17 at 14:22
Arguably, if setting max and min heap sizes identically avoids some kind of problem you should really fix that problem instead.
– Spooler
Feb 28 '18 at 23:40
Thanks for this, you know where you said "Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection." Do you means the size of "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" should be the same ?
– arashsami
Jul 11 '13 at 17:03
Thanks for this, you know where you said "Usually you want it to be the same for some cryptic reasons having to do with minimizing garbage collection." Do you means the size of "-XX:ReservedCodeCacheSize=128m" and "-XX:MaxPermSize=256m" should be the same ?
– arashsami
Jul 11 '13 at 17:03
I think he means make your minimum and maximum heap sizes the same e.g. "-Xms6144m -Xmx6144m".
– Fred Clausen
Jul 12 '13 at 7:09
I think he means make your minimum and maximum heap sizes the same e.g. "-Xms6144m -Xmx6144m".
– Fred Clausen
Jul 12 '13 at 7:09
OMG NO! If someone tells you this a good idea, then they 1) they are probably wrong or 2) there are whole lot of qualifications of when this is a good idea which you've forgotten about
– symcbean
Dec 28 '17 at 14:22
OMG NO! If someone tells you this a good idea, then they 1) they are probably wrong or 2) there are whole lot of qualifications of when this is a good idea which you've forgotten about
– symcbean
Dec 28 '17 at 14:22
Arguably, if setting max and min heap sizes identically avoids some kind of problem you should really fix that problem instead.
– Spooler
Feb 28 '18 at 23:40
Arguably, if setting max and min heap sizes identically avoids some kind of problem you should really fix that problem instead.
– Spooler
Feb 28 '18 at 23:40
add a comment |
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