VMware Adds Ability To Replay Crashes



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June 1, 2007 —  (Page 1 of 2)
As if virtualization hadn’t already made QA engineers’ lives easier, VMware Workstation 6 adds in replay capabilities that allow developers to rewind and step through crashes moment by moment.

Released in the second week of May, the new version of VMware’s desktop product adds support for dual monitors and speed enhancements. But the most significant change to this version is the ability to treat a virtual machine like a VCR: Users can record, play back, rewind and pause the entire virtualized system.

James Phillips, senior director of software life-cycle solutions at VMware, an EMC subsidiary, said that the new record/replay capabilities should help developers glean large amounts of information about their programs by replaying crashes, slowdowns and trouble spots during execution.

“This allows you to begin, at any point in time, recording the activity occurring within a virtual machine. We guarantee the replay will be precisely as it was in the original record time. Developers can go back in time, and run back up to a state where they’re finding a bug or an anomaly. With this technology, you can rewind and run back up to see the states, the I/O and everything else,” said Phillips, who claimed the new capabilities took more than two years to complete.

“We record all timing changes [in a] time-delimited [format] so you can literally go back in time with a debugger and do single-step execution,” said Phillips. “If a crash occurs, it’s going to occur again. You can single-step through the execution and have all external events happen as they were, so you can see precisely what happened from a register perspective or a buffer perspective. You have the ability to roll forward in a deterministic way and see everything you would see in a debug inspection.”

Currently, recorded virtual machine events cannot be transferred from one computer to another, but Phillips did state that this type of thing was in VMware’s plans for the future. “In the current release of the product, we don’t expose [that] functionality…but it is a direction we will be heading in,” he said, adding that future versions of VMware’s server product will take advantage of this technology.




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