Becoming Omniscient with Sayid
summary
Sayid is an omniscient debugger and profiler for Clojure that captures every function call, arguments and return values; it injects a library via a plugin and uses nREPL/CIDER for an Emacs UI, lets you trace namespaces with wildcards, view and query a trace tree, and run an inner-trace at expression level. The profiler reports a net time sum to find hotspots (example: Slowpoke sleeping 50ms). Demo fixes a bug (penny 1 → 0.01) and a Liberator language-mismatch; alpha quality — large traces blow the JVM, inner-trace and dynamic vars can be unreliable.
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