View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0031191 | Lazarus | Widgetset | public | 2017-01-04 20:08 | 2017-04-09 16:43 |
| Reporter | fedan | Assigned To | Zeljan Rikalo | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | fixed | ||
| Platform | qt4/qt5 | OS | Calculate Linux x86_64 | ||
| Product Version | 1.7 (SVN) | ||||
| Summary | 0031191: QtUseNativeEventLoop | ||||
| Description | if QtUseNativeEventLoop defined (default) in lcl/interfaces/{qt,qt5}/qtdefines.inc then cpu utilization one core 100% | ||||
| Tags | No tags attached. | ||||
| Fixed in Revision | 54589 | ||||
| LazTarget | - | ||||
| Widgetset | QT | ||||
| Attached Files |
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CPU ? What wm do you use ? I don't see such problem here on Fedora 24 64bit. Also, what glibc, glib2 and kernel is used by that distribution ? |
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xfce4. glibc-2.22, glib-2.48.2, kernel-4.4.39, Qt-5.7.1 it's my profile of problem, if run on root user then no problem In ROSA Desktop Fresh R8 (KDE 4, Qt-5.6.1) no problem. |
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I resolve problem. if on Qt choose GTK style, then CPU of heavy load. It's only lazarus apps, other apps e.g. qbittorrent, nomacs, smplayer, etc - no load CPU if use GTK style |
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Indeed only gtk theme eats on CPU core (14% on my machine, Fedora 24 64bit i7 processor) , not clever what to do in this case. Native Qt event loop use exactly what is documented in Qt for such scenario. |
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if set 1 ms on QTimer_setInterval in TQtWidgetSet.AppRun then not loads cpu. |
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hm...it's clearly mentioned in Qt docs that timer with timeout=0 should be used for this purpose. I must test what happens with 1ms timeout on mac, win32 and linux using various themes. |
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Is it virtual machine or real hardware ? |
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Real. xeon E5472 |
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Please test and close if ok |
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Tested on both Qt. Closed. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2017-01-04 20:08 | fedan | New Issue | |
| 2017-01-04 22:08 | Zeljan Rikalo | Assigned To | => Zeljan Rikalo |
| 2017-01-04 22:08 | Zeljan Rikalo | Status | new => assigned |
| 2017-01-04 22:10 | Zeljan Rikalo | LazTarget | => - |
| 2017-01-04 22:10 | Zeljan Rikalo | Note Added: 0097295 | |
| 2017-01-04 22:10 | Zeljan Rikalo | Status | assigned => feedback |
| 2017-01-05 00:48 | fedan | Note Added: 0097297 | |
| 2017-01-05 00:48 | fedan | Status | feedback => assigned |
| 2017-01-05 01:26 | fedan | Note Added: 0097298 | |
| 2017-01-05 01:44 | fedan | Note Edited: 0097298 | View Revisions |
| 2017-01-05 21:29 | Zeljan Rikalo | Note Added: 0097322 | |
| 2017-01-05 22:19 | fedan | Note Added: 0097324 | |
| 2017-01-05 22:23 | Zeljan Rikalo | Note Added: 0097325 | |
| 2017-02-10 15:30 | Zeljan Rikalo | Note Added: 0098077 | |
| 2017-02-10 15:30 | Zeljan Rikalo | Status | assigned => feedback |
| 2017-02-19 14:11 | fedan | Note Added: 0098314 | |
| 2017-02-19 14:11 | fedan | Status | feedback => assigned |
| 2017-04-09 11:47 | Zeljan Rikalo | Fixed in Revision | => 54589 |
| 2017-04-09 11:47 | Zeljan Rikalo | Note Added: 0099520 | |
| 2017-04-09 11:47 | Zeljan Rikalo | Status | assigned => resolved |
| 2017-04-09 11:47 | Zeljan Rikalo | Resolution | open => fixed |
| 2017-04-09 16:43 | fedan | Note Added: 0099524 | |
| 2017-04-09 16:43 | fedan | Status | resolved => closed |
