High memory consumption

[psienko]

I have noticed that the tzinfo gem generate many string objects.

Links to problematic lines:

• https://github.com/tzinfo/tzinfo/blob/master/lib/tzinfo/zoneinfo_timezone_info.rb#L131
• https://github.com/tzinfo/tzinfo/blob/master/lib/tzinfo/zoneinfo_timezone_info.rb#L137
• https://github.com/tzinfo/tzinfo/blob/master/lib/tzinfo/zoneinfo_timezone_info.rb#L143
• https://github.com/tzinfo/tzinfo/blob/master/lib/tzinfo/zoneinfo_timezone_info.rb#L150

Maybe good idea will be using freezing strings (e.g. 'NN'.freeze) or storing strings as constants.

Below are memory profiling results for one of request in my application

Results before freezing strings:

allocated memory by gem [bytes]	allocated objects by gem	allocated memory by class [bytes]	allocated objects by class
5519372 tzinfo-1.2.2	181142 tzinfo-1.2.2	29220995 String	324131 String

Results after freezing strings:

allocated memory by gem [bytes]	allocated objects by gem	allocated memory by class [bytes]	allocated objects by class
32160 tzinfo-1.2.2	1044 tzinfo-1.2.2	27375064 String	263417 String

[philr]

Thank you for reporting this. A change to freeze the strings you have identified has been merged as part of #57.

[philr]

The fix for this issue has now been released in version 1.2.3.