Expr stats #14102
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Expr stats #14102
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Radvendii
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xokdvium
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Sep 28, 2025
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| {"total", Expr::nrCreated.load()}, | ||
| {"ExprInt", ExprInt::nrCreated.load()}, | ||
| {"ExprFloat", ExprFloat::nrCreated.load()}, | ||
| {"ExprString", ExprString::nrCreated.load()}, | ||
| {"ExprPath", ExprPath::nrCreated.load()}, | ||
| {"ExprVar", ExprVar::nrCreated.load()}, | ||
| {"ExprInheritFrom", ExprInheritFrom::nrCreated.load()}, | ||
| {"ExprSelect", ExprSelect::nrCreated.load()}, | ||
| {"ExprOpHasAttr", ExprOpHasAttr::nrCreated.load()}, | ||
| {"ExprAttr", ExprAttrs::nrCreated.load()}, | ||
| {"ExprList", ExprList::nrCreated.load()}, | ||
| {"ExprLambda", ExprLambda::nrCreated.load()}, | ||
| {"ExprCall", ExprCall::nrCreated.load()}, | ||
| {"ExprLet", ExprLet::nrCreated.load()}, | ||
| {"ExprWith", ExprWith::nrCreated.load()}, | ||
| {"ExprIf", ExprIf::nrCreated.load()}, | ||
| {"ExprAssert", ExprAssert::nrCreated.load()}, | ||
| {"ExprOpNot", ExprOpNot::nrCreated.load()}, | ||
| {"ExprConcatStrings", ExprConcatStrings::nrCreated.load()}, | ||
| {"ExprPos", ExprPos::nrCreated.load()}, | ||
| {"ExprOpEq", ExprOpEq::nrCreated.load()}, | ||
| {"ExprOpNEq", ExprOpNEq::nrCreated.load()}, | ||
| {"ExprOpAnd", ExprOpAnd::nrCreated.load()}, | ||
| {"ExprOpOr", ExprOpOr::nrCreated.load()}, | ||
| {"ExprOpImpl", ExprOpImpl::nrCreated.load()}, | ||
| {"ExprOpConcatLists", ExprOpConcatLists::nrCreated.load()}, | ||
| {"ExprOpUpdate", ExprOpUpdate::nrCreated.load()}, |
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Sounds like this could really benefit from some macro like NIX_VALUE_STORAGE_FOR_EACH_FIELD to make listing all the expr types less error-prone.
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I suppose... although there's only 2 places where this happens and macros are error-prone in their own ways.
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Motivation
It's useful to know which Exprs are getting made, to know where to focus attention, and to sanity-check how much memory we save by different optimizations. It turns out for a NixOS config evaluation, the top-used Exprs are:
Exprconstructor and therefore increment the total.I know ExprInheritFroms also count as ExprVars, but ExprInheritFroms didn't even make it into the top 5 list, so that doesn't explain the discrepancy.
Context
Relevant to my work tracked in #14088
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