StringBuilder default constructor in the class library
While analyzing GC pressure of a run time, I noticed the top object being a char[], upon a closer inspection, it turns out to be a result of ObjectStreamClass use of StringBuilder, which is constructed with the default size of 16 bytes. In such case 16 bytes is not a sufficient size, which leads to unnecessary garbage and incurs a performance hit. In a high volume situation this leads to high GC pressure, and in turn, non uniform performance. It's worthwhile revisiting all uses of StringBuilder default constructor in the class library and adjusting it appropriately. Thoughts?
Hi Hamada , Looking at initial sizes (of StringBuilder) would be a useful contribution. Take a look at http://openjdk.java.net/contribute/ for how to contribute. Regards, Roger On 12/14/2017 12:03 PM, Hamada Abdelaziz wrote:
While analyzing GC pressure of a run time, I noticed the top object being a char[], upon a closer inspection, it turns out to be a result of ObjectStreamClass use of StringBuilder, which is constructed with the default size of 16 bytes. In such case 16 bytes is not a sufficient size, which leads to unnecessary garbage and incurs a performance hit.
In a high volume situation this leads to high GC pressure, and in turn, non uniform performance.
It's worthwhile revisiting all uses of StringBuilder default constructor in the class library and adjusting it appropriately.
Thoughts?
participants (2)
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Hamada Abdelaziz
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Roger Riggs