Equation 2 · Part 1 · Comparing the Main Approaches to AI Datacenter Systems Engineering

Symbol w_cp

w_{cp}

w_{cp}

What this part means

the time to write a checkpoint.

Its job in the formula

$w_c$ p is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Full expressionSymbol w_cpArticle meaning

Where the article explains it

where $w_{cp}$ is the time to write a checkpoint, $N_{\text{nodes}}$ is the job’s node count, and $r_f$ is the per-node failure rate.

The passage around this formula

where $w_{cp}$ is the time to write a checkpoint, $N_{\text{nodes}}$ is the job’s node count, and $r_f$ is the per-node failure rate. As $N_{\text{nodes}}$ grows, the failure rate the job experiences as a whole scales with it, which pulls the optimal interval shorter — meaning larger jobs must checkpoint more…

Read this part in the article →

Learn the underlying idea

A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

Open the illustrated subscripts: which member of a family? guide →

See this notation across published equations →

Sources cited in the surrounding passage

[7] Revisiting Reliability in Large-Scale Machine Learning Research Clusters ↗

These citations provide research context; check each source for the exact claim it supports.