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Error java.lang.OutOfMemoryError: GC overhead limit exceeded
...age collector is taking an excessive amount of time (by default 98% of all CPU time of the process) and recovers very little memory in each run (by default 2% of the heap).
This effectively means that your program stops doing any progress and is busy running only the garbage collection at all time....
Best practice for creating millions of small temporary objects
... is not always the case. A lot of objects you create does not even leave a CPU register. For instance, consider this for-loop
for(int i=0, i<max, i++) {
// stuff that implies i
}
Let's not think about loop unrolling (an optimisations that the JVM heavily performs on your code). If max is equ...
What resources are shared between threads?
...
about point no 2 above : For threads also CPU maintains a context.
– Jack
May 2 '13 at 6:14
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Is MD5 still good enough to uniquely identify files?
...ower that the probability of the comparison failing due to glitches in the CPU generated by normal solar gamma ray emissions. And don't forget that often the only source of the file is sitting on the other side of the world inside a web server, and the only independent piece of information you have ...
Maximum number of records in a MySQL database table
...4.16xlarge AWS instances (1 reader, 1 writer). Each of the machines had 64 CPU cores, 488GB of ram, 25Gbps network link, 64TB of disk. This scale of db was pushing both CPU and disk size limits and AWS does not provide any larger DB optimized instances. It was replaced with a simpler db schema that...
What is the runtime performance cost of a Docker container?
...ownload it for full access.
Taking a look at Disk I/O:
Now looking at CPU overhead:
Now some examples of memory (read the paper for details, memory can be extra tricky):
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How to Deal with Temporary NSManagedObject instances?
...ul as standing up a NSManagedObjectContext is expensive in both memory and CPU. I realize this was originally in some of the Apple examples, but they have updated and corrected those examples.
– Marcus S. Zarra
Jul 16 '10 at 15:39
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Database sharding vs partitioning
...important to understand that databases are extremely resource intensive:
CPU
Disk
I/O
Memory
Many DBA's will partition on the same machine, where the partitions will share all the resources but provide an improvement in disk and I/O by splitting up the data and/or index.
While other strategies ...
How to deal with a slow SecureRandom generator?
...ized environment because it doesn't require any special hardware, only the CPU itself and a clock.
On Ubuntu/Debian:
apt-get install haveged
update-rc.d haveged defaults
service haveged start
On RHEL/CentOS:
yum install haveged
systemctl enable haveged
systemctl start haveged
Option 2. Reduce...
Volatile vs Static in Java
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What is the cache when you say "locally cached"? CPU cache, some kind of JVM cache?
– mert inan
Dec 17 '12 at 21:15
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