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* When NIX_SHOW_STATS=1, show the amount of stack space consumed by

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the Nix expression evaluator.
This commit is contained in:
Eelco Dolstra 2007-02-27 17:28:51 +00:00
parent 363e307fd3
commit adce01a8d0
1 changed files with 10 additions and 2 deletions
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12
src/libexpr/eval.cc
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@ -362,8 +362,14 @@ Expr autoCallFunction(Expr e, const ATermMap & args)
} }
static char * deepestStack = (char *) -1; /* for measuring stack usage */
Expr evalExpr2(EvalState & state, Expr e) Expr evalExpr2(EvalState & state, Expr e)
{ {
char x;
if (&x < deepestStack) deepestStack = &x;
Expr e1, e2, e3, e4; Expr e1, e2, e3, e4;
ATerm name, pos; ATerm name, pos;
AFun sym = ATgetAFun(e); AFun sym = ATgetAFun(e);
@ -752,12 +758,14 @@ extern "C" {
void printEvalStats(EvalState & state) void printEvalStats(EvalState & state)
{ {
char x;
bool showStats = getEnv("NIX_SHOW_STATS", "0") != "0"; bool showStats = getEnv("NIX_SHOW_STATS", "0") != "0";
printMsg(showStats ? lvlInfo : lvlDebug, printMsg(showStats ? lvlInfo : lvlDebug,
format("evaluated %1% expressions, %2% cache hits, %3%%% efficiency, used %4% ATerm bytes") format("evaluated %1% expressions, %2% cache hits, %3%%% efficiency, used %4% ATerm bytes, used %5% bytes of stack space")
% state.nrEvaluated % state.nrCached % state.nrEvaluated % state.nrCached
% ((float) state.nrCached / (float) state.nrEvaluated * 100) % ((float) state.nrCached / (float) state.nrEvaluated * 100)
% AT_calcAllocatedSize()); % AT_calcAllocatedSize()
% (&x - deepestStack));
if (showStats) if (showStats)
printATermMapStats(); printATermMapStats();
} }