remove profiling from nushell's hot loop (#10325)

# Description

This removes pipeline element profiling. This could be a useful feature,
but pipeline elements are going to be the most sensitive to in terms of
performance, as `eval_block` and how pipelines are built is one of the
hot loops inside of the eval engine.

# User-Facing Changes

Removes pipeline element profiling.

# Tests + Formatting
<!--
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crates/nu-command/src/debug/profile.rs

@@ -1,6 +1,6 @@
 use nu_engine::{eval_block, CallExt};
 use nu_protocol::ast::Call;
-use nu_protocol::engine::{Closure, Command, EngineState, ProfilingConfig, Stack};
+use nu_protocol::engine::{Closure, Command, EngineState, Stack};
 use nu_protocol::{
     Category, DataSource, Example, IntoPipelineData, PipelineData, PipelineMetadata, Signature,
     Spanned, SyntaxShape, Type, Value,
@@ -70,24 +70,13 @@ Current known limitations are:
             }
         }
 
-        stack.profiling_config = ProfilingConfig::new(
-            call.get_flag::<i64>(engine_state, &mut stack, "max-depth")?
-                .unwrap_or(1),
-            call.has_flag("source"),
-            call.has_flag("values"),
-        );
-
-        let profiling_metadata = Box::new(PipelineMetadata {
-            data_source: DataSource::Profiling(vec![]),
-        });
-
         let result = if let Some(PipelineMetadata {
             data_source: DataSource::Profiling(values),
         }) = eval_block(
             engine_state,
             &mut stack,
             block,
-            input_val.into_pipeline_data_with_metadata(profiling_metadata),
+            input_val.into_pipeline_data(),
             redirect_stdout,
             redirect_stderr,
         )?

crates/nu-engine/src/eval.rs

@@ -5,13 +5,11 @@ use nu_protocol::{
         eval_operator, Argument, Assignment, Bits, Block, Boolean, Call, Comparison, Expr,
         Expression, Math, Operator, PathMember, PipelineElement, Redirection,
     },
-    engine::{EngineState, ProfilingConfig, Stack},
-    record, DataSource, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
-    PipelineMetadata, Range, Record, ShellError, Span, Spanned, Unit, Value, VarId,
-    ENV_VARIABLE_ID,
+    engine::{EngineState, Stack},
+    IntoInterruptiblePipelineData, IntoPipelineData, PipelineData, Range, Record, ShellError, Span,
+    Spanned, Unit, Value, VarId, ENV_VARIABLE_ID,
 };
 use std::collections::HashMap;
-use std::time::Instant;
 
 pub fn eval_call(
     engine_state: &EngineState,
@@ -1016,13 +1014,6 @@ pub fn eval_block(
 
     let num_pipelines = block.len();
 
-    let mut input_metadata = if stack.profiling_config.should_debug() {
-        stack.profiling_config.enter_block();
-        input.metadata()
-    } else {
-        None
-    };
-
     for (pipeline_idx, pipeline) in block.pipelines.iter().enumerate() {
         let mut i = 0;
 
@@ -1036,12 +1027,6 @@ pub fn eval_block(
                             | PipelineElement::SeparateRedirection { .. }
                     )));
 
-            let start_time = if stack.profiling_config.should_debug() {
-                Some(Instant::now())
-            } else {
-                None
-            };
-
             // if eval internal command failed, it can just make early return with `Err(ShellError)`.
             let eval_result = eval_element_with_input(
                 engine_state,
@@ -1060,34 +1045,6 @@ pub fn eval_block(
                 redirect_stderr,
             );
 
-            let end_time = if stack.profiling_config.should_debug() {
-                Some(Instant::now())
-            } else {
-                None
-            };
-
-            if let (Some(start_time), Some(end_time), Some(input_metadata)) =
-                (start_time, end_time, input_metadata.as_deref_mut())
-            {
-                let element_span = pipeline.elements[i].span();
-                let element_str = String::from_utf8_lossy(
-                    engine_state.get_span_contents(pipeline.elements[i].span()),
-                )
-                .to_string();
-
-                collect_profiling_metadata(
-                    pipeline_idx,
-                    i,
-                    element_str,
-                    element_span,
-                    start_time,
-                    end_time,
-                    &stack.profiling_config,
-                    &eval_result,
-                    input_metadata,
-                );
-            }
-
             match (eval_result, redirect_stderr) {
                 (Ok((pipeline_data, _)), true) => {
                     input = pipeline_data;
@@ -1112,9 +1069,6 @@ pub fn eval_block(
                     // make early return so remaining commands will not be executed.
                     // don't return `Err(ShellError)`, so nushell wouldn't show extra error message.
                     if output.1 {
-                        if stack.profiling_config.should_debug() {
-                            stack.profiling_config.leave_block();
-                        }
                         return Ok(input);
                     }
                 }
@@ -1148,12 +1102,7 @@ pub fn eval_block(
         }
     }
 
-    if stack.profiling_config.should_debug() {
-        stack.profiling_config.leave_block();
-        Ok(input.set_metadata(input_metadata))
-    } else {
-        Ok(input)
-    }
+    Ok(input)
 }
 
 pub fn eval_subexpression(
@@ -1208,86 +1157,3 @@ pub fn eval_variable(
 fn compute(size: i64, unit: Unit, span: Span) -> Result<Value, ShellError> {
     unit.to_value(size, span)
 }
-
-#[allow(clippy::too_many_arguments)]
-fn collect_profiling_metadata(
-    pipeline_idx: usize,
-    element_idx: usize,
-    element_str: String,
-    element_span: Span,
-    start_time: Instant,
-    end_time: Instant,
-    profiling_config: &ProfilingConfig,
-    eval_result: &Result<(PipelineData, bool), ShellError>,
-    input_metadata: &mut PipelineMetadata,
-) {
-    let element_str = Value::string(element_str, element_span);
-    let time_ns = (end_time - start_time).as_nanos() as i64;
-
-    let span_record = record! {
-        "start" => Value::int(element_span.start as i64, element_span),
-        "end" => Value::int(element_span.end as i64, element_span),
-    };
-
-    let mut record = record! {
-        "pipeline_idx" => Value::int(pipeline_idx as i64, element_span),
-        "element_idx" => Value::int(element_idx as i64, element_span),
-        "depth" => Value::int(profiling_config.depth, element_span),
-        "span" => Value::record(span_record, element_span),
-    };
-
-    if profiling_config.collect_source {
-        record.push("source", element_str);
-    }
-
-    if profiling_config.collect_values {
-        let value = match &eval_result {
-            Ok((PipelineData::Value(val, ..), ..)) => val.clone(),
-            Ok((PipelineData::ListStream(..), ..)) => Value::string("list-stream", element_span),
-            Ok((PipelineData::ExternalStream { .. }, ..)) => {
-                Value::string("raw stream", element_span)
-            }
-            Ok((PipelineData::Empty, ..)) => Value::nothing(element_span),
-            Err(err) => Value::error(err.clone(), element_span),
-        };
-
-        record.push("value", value);
-    }
-
-    record.push("time", Value::duration(time_ns, element_span));
-
-    let record = Value::record(record, element_span);
-
-    let element_metadata = if let Ok((pipeline_data, ..)) = &eval_result {
-        pipeline_data.metadata()
-    } else {
-        None
-    };
-
-    if let PipelineMetadata {
-        data_source: DataSource::Profiling(tgt_vals),
-    } = input_metadata
-    {
-        tgt_vals.push(record);
-    } else {
-        *input_metadata = PipelineMetadata {
-            data_source: DataSource::Profiling(vec![record]),
-        };
-    }
-
-    if let Some(PipelineMetadata {
-        data_source: DataSource::Profiling(element_vals),
-    }) = element_metadata.map(|m| *m)
-    {
-        if let PipelineMetadata {
-            data_source: DataSource::Profiling(tgt_vals),
-        } = input_metadata
-        {
-            tgt_vals.extend(element_vals);
-        } else {
-            *input_metadata = PipelineMetadata {
-                data_source: DataSource::Profiling(element_vals),
-            };
-        }
-    }
-}

crates/nu-protocol/src/engine/stack.rs

@@ -7,44 +7,6 @@ use crate::{ShellError, Span, Value, VarId};
 /// Environment variables per overlay
 pub type EnvVars = HashMap<String, HashMap<String, Value>>;
 
-#[derive(Debug, Clone)]
-pub struct ProfilingConfig {
-    pub max_depth: i64,
-    pub depth: i64,
-    pub collect_source: bool,
-    pub collect_values: bool,
-}
-
-impl ProfilingConfig {
-    pub fn new(max_depth: i64, collect_source: bool, collect_values: bool) -> Self {
-        ProfilingConfig {
-            max_depth,
-            depth: 0,
-            collect_source,
-            collect_values,
-        }
-    }
-
-    pub fn enter_block(&mut self) {
-        self.depth += 1;
-    }
-
-    pub fn leave_block(&mut self) {
-        self.depth -= 1;
-    }
-
-    pub fn should_debug(&self) -> bool {
-        self.depth <= self.max_depth
-    }
-
-    pub fn reset(&mut self) {
-        self.max_depth = 0;
-        self.depth = 0;
-        self.collect_source = false;
-        self.collect_values = false;
-    }
-}
-
 /// A runtime value stack used during evaluation
 ///
 /// A note on implementation:
@@ -73,7 +35,6 @@ pub struct Stack {
     /// List of active overlays
     pub active_overlays: Vec<String>,
     pub recursion_count: Box<u64>,
-    pub profiling_config: ProfilingConfig,
 }
 
 impl Stack {
@@ -84,7 +45,6 @@ impl Stack {
             env_hidden: HashMap::new(),
             active_overlays: vec![DEFAULT_OVERLAY_NAME.to_string()],
             recursion_count: Box::new(0),
-            profiling_config: ProfilingConfig::new(0, false, false),
         }
     }
 
@@ -195,7 +155,6 @@ impl Stack {
             env_hidden: self.env_hidden.clone(),
             active_overlays: self.active_overlays.clone(),
             recursion_count: self.recursion_count.to_owned(),
-            profiling_config: self.profiling_config.clone(),
         }
     }
 
@@ -223,7 +182,6 @@ impl Stack {
             env_hidden: self.env_hidden.clone(),
             active_overlays: self.active_overlays.clone(),
             recursion_count: self.recursion_count.to_owned(),
-            profiling_config: self.profiling_config.clone(),
         }
     }