GC | A lightweight conservative garbage collector for C/C | Script Programming library
kandi X-RAY | GC Summary
kandi X-RAY | GC Summary
This GC was designed and implemented by Gregory J. Duck. The official website is here:.
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QUESTION
There is a Java 11 (SpringBoot 2.5.1) application with simple workflow:
- Upload archives (as multipart files with size 50-100 Mb each)
- Unpack them in memory
- Send each unpacked file as a message to a queue via JMS
When I run the app locally java -jar app.jar
its memory usage (in VisualVM) looks like a saw: high peaks (~ 400 Mb) over a stable baseline (~ 100 Mb).
When I run the same app in a Docker container memory consumption grows up to 700 Mb and higher until an OutOfMemoryError. It appears that GC does not work at all. Even when memory options are present (java -Xms400m -Xmx400m -jar app.jar
) the container seems to completely ignore them still consuming much more memory.
So the behavior in the container and in OS are dramatically different.
I tried this Docker image in DockerDesktop Windows 10
and in OpenShift 4.6
and got two similar pictures for the memory usage.
Dockerfile
...ANSWER
Answered 2021-Jun-13 at 03:31In Java 11, you can find out the flags that have been passed to the JVM and the "ergonomic" ones that have been set by the JVM by adding -XX:+PrintCommandLineFlags
to the JVM options.
That should tell you if the container you are using is overriding the flags you have given.
Having said that, its is (IMO) unlikely that the container is what is overriding the parameters.
It is not unusual for a JVM to use more memory that the -Xmx
option says. The explanation is that that option only controls the size of the Java heap. A JVM consumes a lot of memory that is not part of the Java heap; e.g. the executable and native libraries, the native heap, metaspace, off-heap memory allocations, stack frames, mapped files, and so on. Depending on your application, this could easily exceed 300MB.
Secondly, OOMEs are not necessarily caused by running out of heap space. Check what the "reason" string says.
Finally, this could be a difference in your app's memory utilization in a containerized environment versus when you run it locally.
QUESTION
ANSWER
Answered 2021-Jun-14 at 07:20As per comments, you can run:
QUESTION
MDN says:
The yield keyword causes the call to the generator's next() method to return an IteratorResult object with two properties: value and done. The value property is the result of evaluating the yield expression, and done is false, indicating that the generator function has not fully completed.
I ran a test in Chrome 91.0.4472.77 and it appears to be a fresh object every single time. Which seems very wasteful if the processing is fine grained (high numbers of iterations, each with low computation). To avoid unpredictable throughput and GC jank, this is undesirable.
To avoid this, I can define an iterator function, where I can control (ensure) the reuse of the {value, done}
object by each next()
causing the property values to be modified in place, ie. there's no memory allocation for a new {value, done}
object.
Am I missing something, or do generators have this inherent garbage producing nature? Which browsers are smart enough to not allocate a new {value, done}
object if all I do is const {value, done} = generatorObject.next();
ie. I can't possibly gain a handle on the object, ie. no reason for the engine to allocate a fresh object?
ANSWER
Answered 2021-Jun-13 at 03:59It is a requirement of the ECMAScript specification for generators to allocate a new object for each yield, so all compliant JS engines have to do it.
It is possible in theory for a JS engine to reuse a generator's result object if it can prove that the program's observable behavior would not change as a result of this optimization, such as when the only use of the generator is in a const {value, done} = generatorObject.next()
statement. However, I am not aware of any engines (at least those that are used in popular web browsers) that do this. Optimizations like this are a very hard problem in JavaScript because of its dynamic nature.
QUESTION
I'm running java application(ksqldb 0.15.0) on GKE cluster, and passed the java opts -Xms3G
and -Xmx5G
.
-Xmx
option is working well, but -Xms
options seems not to be effected.
The running command is as follows;
...ANSWER
Answered 2021-Mar-30 at 23:38-Xms
sets the initial heap size, not the minimum size.
NGCMN
and OGCMN
denote the minimum capacity of the new generation and the old generation respectively. These numbers are useless most of the time. What you probably wanted to look at is NGC
/OGC
- the current capacity of the new generation and the old generation.
You've set -Xms3G
, and the current heap size is exactly
QUESTION
I am new to Objective-c. I am using swiftui to make my app. But need to implant objective-c code for BLE. all work until I get this code
in .h file
...ANSWER
Answered 2021-Jun-11 at 22:36Search your code for where the @interface for ESPTaskParameter is defined, that will be in some .h file. Then, make sure the .m file #imports that header file. If it doesn’t the there would indeed be no visible interface defining the selector you want to call to the .m file that is trying to call it
And check that the interface .h does indeed declare a public setter for broadcast.
QUESTION
I am trying to apply an example from R "particles" package to ocean velocity data (kinetic energy). Example data is as follows:
...ANSWER
Answered 2021-Jun-12 at 14:45The problem is that kee
is a vector and not a matrix. So ncol
and nrow
return as NULL
instead of an actual number. Here is a smaller reproducible example of why it is failing:
QUESTION
If you compile two C programs that differ only in the return value, I'd expect the binary to differ only in the bits of this value. However, if I compile the following programs using GCC, dump the bits of the binary (using xxd) and diff the dumps, I get another difference.
Files return127.c ...ANSWER
Answered 2021-Jun-12 at 13:01What is the difference at the top?
It's build id difference. Install diffoscope
(or compare readelf --wide --notes
output from both libraries) and you'll nicely see:
QUESTION
I am not a scripter, please if anyone can help me with modify below script by removing UCPID value but keep only servername
Currently below script looking two columns from csv file, now I want to change the behavior to only look for ServerName because now CSV file have only one column which containing server only in each row and update related XML.
...ANSWER
Answered 2021-Jun-12 at 12:59If your XML looks like this:
QUESTION
kubectl version
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.0", GitCommit:"cb303e613a121a29364f75cc67d3d580833a7479", GitTreeState:"clean", BuildDate:"2021-04-08T21:16:14Z", GoVersion:"go1.16.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.1", GitCommit:"5e58841cce77d4bc13713ad2b91fa0d961e69192", GitTreeState:"clean", BuildDate:"2021-05-12T14:12:29Z", GoVersion:"go1.16.4", Compiler:"gc", Platform:"linux/amd64"}
...ANSWER
Answered 2021-Jun-12 at 02:54I notice that you're connecting to https://mydomain.dev
, but passing a host header for a different domain. My guess would be that curl
is sending an SNI request for a mydomain.dev
cert; since networking-ns-cert
will acquire wildcard certs for *..my domain.dev
, it's possible that the server doesn't have a cert matching the SNI request, and closes the TCP connection.
Try using the -kvv
options to curl
(instead of -v
) to print more verbose debugging information and bypass some SSL errors. Since you have DNS and certs set up, I'd try:
curl -kvv https://helloworld-go.default.mydomain.dev
QUESTION
The app has:
- ListView listing player names from a DB table (only one column, so it is primary key)
- EditText to write the new name
- Button to update the name of player in the list
*there are more things, but i don´t want to make it more messy
I can click a name from the list and write a new name in the EditText. When you press the button that name is updated in the list.
Everything works correctly, but there is a problem. When I write a name that it is already in the list the app fails because primary keys cannot be repeated.
Is there some way to say "if EditText text already exists in the DB... then show a toast"
I already tried "if result of db.update is -1...then show a toast", but it doesn´t work.
This is the method in MainActivity:
...ANSWER
Answered 2021-Jun-11 at 22:09Issues
You have a UNIQUE index on the NUM_JUG column (perhaps implicit if NON_JUG is defined with PRIMARY KEY) and you are using the standard update method which uses the default conflict action of ABORT and therefore fails if an attempt is made to duplicate a NOM_JUG value.
As secondary issue is that the SQLiteDatabase update
method returns the number of updates (see extract and link below) (same for updateWithOnConflict
). The number returned will never be -1 it will be 0 or more (0 indicating that no updates have been applied).
As per SQLite Database - Update
Returns
int the number of rows affected
Fix
To fix the main issue you should use the updateWithOnConflict
method. This takes a 4th parameter a conflict and you probably want IGNORE so you could use :-
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