OK, but it&#x27;s more expensive that &quot;free&quot;, and they didn&#x27;t previously list their prices, but now I see at the excellent <a href="https:&#x2F;&#x2F;www.azul.com&#x2F;products&#x2F;zing&#x2F;zinqfaq&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.azul.com&#x2F;products&#x2F;zing&#x2F;zinqfaq&#x2F;</a><p><i>Zing is priced on a subscription basis per server.... The annualized subscription price for Zing per physical server ranges from $3500 (for several hundred servers) to $8000. Higher volumes and longer subscription terms will reduce the per-server price for Zing. Pricing for virtual servers is also available upon request.</i><p>Since you&#x27;re likely to be running it on a server with a hardware cost approximately the same or larger, next time I&#x27;ll only use two dollar signs ($$) ^_^.<p>And I&#x27;ve indeed heard it&#x27;s popular with financial trading firms for the obvious reasons.  Up to 1 TiB heap, no problem, and no 1,024 second pause which other collectors require for a full GC.