Cliff Click

Registered user since Fri 5 Sep 2014

Name: Cliff Click

Bio: Cliff Click is the CTO and Co-Founder of H2O, makers of H2O, the open source math and machine learning engine for Big Data. Cliff wrote his first compiler when he was 15 (Pascal to TRS Z-80!), although Cliff’s most famous compiler is the HotSpot Server Compiler (the Sea of Nodes IR). Cliff helped Azul Systems build an 864 core pure-Java mainframe that keeps GC pauses on 500Gb heaps to under 10ms, and worked on all aspects of that JVM. Before that he worked on HotSpot at Sun Microsystems, and was at least partially responsible for bringing Java into the mainstream. Cliff is invited to speak regularly at industry and academic conferences and has published many papers about HotSpot technology. He holds a PhD in Computer Science from Rice University and about 20 patents.

Country: United States

Affiliation: 0xdata

Personal website:

Research interests: Virtual machines, compilers, data analytics


SPLASH 2020Author of Tales from the Frontlines: Startup War Stories within the REBASE-track
CurryOn 2018Author of Lessons from a Big Data Machine Learning Startup within the Curry On Talks-track
WoSSCA 2018Committee Member in Program Committee within the WoSSCA 2018-track
ECOOP and ISSTA 2018Mentor in Mentors within the Summer School-track
Speaker of Writing Virtual Machines for fun and profit within the Summer School-track
Speaker in Speakers within the Summer School-track
ECOOP 2015Presenter of Bits of Advice for VM Writers within the Curry On-track