[soulnothing]

I recently did a deep dive on gc issues at work, and compared eden the default collector and z.

Our app was collecting pretty heavily, and an average collection time of about 50ms. With Z, and Linux huge pages it was collecting sub millisecond. This was at the cost of a bit more cpu, as z uses more threads for collection.

Using gatling for performance testing, we saw a small increase in requests per second. But the benefit was a smoother response time, with less spikes to high p9X measures.

Using flight recorder with this is a great way to get details of how the gc is performing.

Addendum: As noted below zgc uses more memory, I only found it viable on 16GB heaps or above. With it really improving performance around 32GB.