Created
November 8, 2012 22:04
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Demonstration of pv reference leak
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| import epics,gc | |
| name1 = "c1v0:UPTIME" | |
| name2 = "c2v0:UPTIME" | |
| name3 = "c3v0:UPTIME" | |
| def report_usage(): | |
| epics.ca.show_cache() | |
| # use the gc's debugging features to look for leaked PV objects | |
| gc.collect() | |
| print("Live PV object count: %d" % len([o for o in gc.get_objects() if type(o) == epics.PV])) | |
| print("") | |
| def do_some_stuff(): | |
| p = epics.PV(name1) | |
| p = epics.PV(name2) | |
| p = epics.PV(name3) | |
| p = None | |
| report_usage() | |
| do_some_stuff() | |
| do_some_stuff() | |
| do_some_stuff() |
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| # PVName ChannelID/Context Connected? | |
| #-------------------------------------------- | |
| c2v0:UPTIME c_long(47668984)/47633616 False | |
| c1v0:UPTIME c_long(47668928)/47633616 False | |
| c3v0:UPTIME c_long(47669040)/47633616 False | |
| Live PV object count: 3 | |
| # PVName ChannelID/Context Connected? | |
| #-------------------------------------------- | |
| c2v0:UPTIME c_long(47668984)/47633616 False | |
| c1v0:UPTIME c_long(47668928)/47633616 False | |
| c3v0:UPTIME c_long(47669040)/47633616 False | |
| Live PV object count: 6 | |
| # PVName ChannelID/Context Connected? | |
| #-------------------------------------------- | |
| c2v0:UPTIME c_long(47668984)/47633616 False | |
| c1v0:UPTIME c_long(47668928)/47633616 False | |
| c3v0:UPTIME c_long(47669040)/47633616 False | |
| Live PV object count: 9 |
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| # PVName ChannelID/Context Connected? | |
| #-------------------------------------------- | |
| c2v0:UPTIME c_long(31308984)/31271728 False | |
| c1v0:UPTIME c_long(31308928)/31271728 False | |
| c3v0:UPTIME c_long(31309040)/31271728 False | |
| Live PV object count: 0 | |
| # PVName ChannelID/Context Connected? | |
| #-------------------------------------------- | |
| c2v0:UPTIME c_long(31308984)/31271728 False | |
| c1v0:UPTIME c_long(31308928)/31271728 False | |
| c3v0:UPTIME c_long(31309040)/31271728 False | |
| Live PV object count: 0 | |
| # PVName ChannelID/Context Connected? | |
| #-------------------------------------------- | |
| c2v0:UPTIME c_long(31308984)/31271728 False | |
| c1v0:UPTIME c_long(31308928)/31271728 False | |
| c3v0:UPTIME c_long(31309040)/31271728 False | |
| Live PV object count: 0 |
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