Re: [SailfishDevel] QML arrays and memory leak
Thanks for all your comments on this problem. I have been using these last couple of months testing many different solutions, also those proposed here, but none have worked! Now I have solved the problem by using an circular buffer instead of an array, so when I add a value I just changes the value at the current end of the buffer, and moves the end pointer to the next element, if the end pointer equals the start pointer that one is moved forward one place. That's it, no more memory leak, at least none I have detected yet ;) /Kim ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
Re: [SailfishDevel] QML arrays and memory leak
Dnia 2015-05-04, pon o godzinie 22:20 +0200, Kim Foder pisze: This works great, but it leaks memory fast, and after some time (between 1 2 hours) the OS kills all running apps! Any ideas how I can solve this? Possibly you are creating/destroying values so fast, that GC does not have time to kick in. Maybe try calling QJSEngine::collectGarbage() [1] manually every few iterations. (QQmlEngine subclasses QJSEngine) [1] http://doc.qt.io/qt-5/qjsengine.html#collectGarbage -- /o__ (_^' No problem is insoluble. ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
Re: [SailfishDevel] QML arrays and memory leak
On Monday 04 May 2015 22:20:17 Kim Foder wrote: Hi For some time I have been battling a memory leak in my pedometer app, after a lot of experimentation, I have found the problem to be my use of arrays (probably)! Whenever I receive an acceleration measurement, some statistical calculations are made, which results in one float pr. measurement. As I need the measurements for a certain time for further statistical analysis, the results are stored in an array, used as an traveling window like this: accarr.shift(); // the array is pre-initialized with empty elements. accarr.push(float); This works great, but it leaks memory fast, and after some time (between 1 2 hours) the OS kills all running apps! Any ideas how I can solve this? Do you remove the obsolete values from the array? You don't show that in the code snippet. -- Med venlig hilsen / Best regards Thomas Tanghus ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
Re: [SailfishDevel] QML arrays and memory leak
Hi Kim, ohh! Okay! Have you tried splice instead? Array.prototype.splice (start, deleteCount [ , item1 [ , item2 [ , … ] ] ] ) I think maybe something like: accarr.splice(0,1,float) Looks more neat and it is in the normal javascript canon. Did not find the documentation on javascript and qt quick in the rush. Hope it helps you as a work around. Peter On 04.05.2015 23:08, Kim Foder wrote: Hi Peter Why use an array and not a vector or an Hash map? As far as I know those are not supported under javascript, otherwise a vector would have been my first choice, an Hash map is overkill for my needs, I only need to add to the end, and always need sequential read. I am tempted to move the business part to C++, but I'm trying to do as much as possible in QML (as an exercise). /Kim Am 04.05.2015 22:20 schrieb Kim Foder k...@foder.dk: Hi For some time I have been battling a memory leak in my pedometer app, after a lot of experimentation, I have found the problem to be my use of arrays (probably)! Whenever I receive an acceleration measurement, some statistical calculations are made, which results in one float pr. measurement. As I need the measurements for a certain time for further statistical analysis, the results are stored in an array, used as an traveling window like this: accarr.shift(); // the array is pre-initialized with empty elements. accarr.push(float); This works great, but it leaks memory fast, and after some time (between 1 2 hours) the OS kills all running apps! Any ideas how I can solve this? Thanks. Kim ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
Re: [SailfishDevel] QML arrays and memory leak
Hi Peter Why use an array and not a vector or an Hash map? As far as I know those are not supported under javascript, otherwise a vector would have been my first choice, an Hash map is overkill for my needs, I only need to add to the end, and always need sequential read. I am tempted to move the business part to C++, but I'm trying to do as much as possible in QML (as an exercise). /Kim Am 04.05.2015 22:20 schrieb Kim Foder k...@foder.dk: Hi For some time I have been battling a memory leak in my pedometer app, after a lot of experimentation, I have found the problem to be my use of arrays (probably)! Whenever I receive an acceleration measurement, some statistical calculations are made, which results in one float pr. measurement. As I need the measurements for a certain time for further statistical analysis, the results are stored in an array, used as an traveling window like this: accarr.shift(); // the array is pre-initialized with empty elements. accarr.push(float); This works great, but it leaks memory fast, and after some time (between 1 2 hours) the OS kills all running apps! Any ideas how I can solve this? Thanks. Kim ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
Re: [SailfishDevel] QML arrays and memory leak
Why use an array and not a vector or an Hash map? Am 04.05.2015 22:20 schrieb Kim Foder k...@foder.dk: Hi For some time I have been battling a memory leak in my pedometer app, after a lot of experimentation, I have found the problem to be my use of arrays (probably)! Whenever I receive an acceleration measurement, some statistical calculations are made, which results in one float pr. measurement. As I need the measurements for a certain time for further statistical analysis, the results are stored in an array, used as an traveling window like this: accarr.shift(); // the array is pre-initialized with empty elements. accarr.push(float); This works great, but it leaks memory fast, and after some time (between 1 2 hours) the OS kills all running apps! Any ideas how I can solve this? Thanks. Kim ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org ___ SailfishOS.org Devel mailing list To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
