alamb commented on code in PR #17021:
URL: https://github.com/apache/datafusion/pull/17021#discussion_r2263831579
##########
datafusion-cli/src/exec.rs:
##########
@@ -227,9 +227,19 @@ pub(super) async fn exec_and_print(
let statements = DFParser::parse_sql_with_dialect(&sql, dialect.as_ref())?;
for statement in statements {
+ let _mem_handle = if print_options.memory_profiling {
+ // RAII guard: dropping the handle disables profiling after
execution
+ Some(ctx.enable_memory_profiling())
+ } else {
+ None
+ };
StatementExecutor::new(statement)
.execute(ctx, print_options)
.await?;
+ // disable after each statement
Review Comment:
If you are going to use a RAAI style thing I would expect the `Drop` impl to
disable profiling 🤔
##########
datafusion-cli/src/print_options.rs:
##########
@@ -73,6 +73,7 @@ pub struct PrintOptions {
pub quiet: bool,
pub maxrows: MaxRows,
pub color: bool,
+ pub memory_profiling: bool,
Review Comment:
memory profiling seems like something that should be attached to the session
context, as it is not related to formatting output
##########
datafusion-cli/src/exec.rs:
##########
@@ -54,7 +54,7 @@ use tokio::signal;
pub async fn exec_from_commands(
ctx: &dyn CliSessionContext,
commands: Vec<String>,
- print_options: &PrintOptions,
+ print_options: &mut PrintOptions,
Review Comment:
It seems strange that now PrintOptions are mutable - why would executing a
command change the options?
##########
datafusion/core/src/execution/context/mod.rs:
##########
@@ -90,6 +90,244 @@ use chrono::{DateTime, Utc};
use object_store::ObjectStore;
use parking_lot::RwLock;
use url::Url;
+/// Memory profiling report for a query.
+#[derive(Debug, Clone, Default, PartialEq, Eq)]
+pub struct MemoryReport {
+ metrics: std::collections::HashMap<String, usize>,
+}
+
+impl MemoryReport {
+ /// Create a new [`MemoryReport`] from the provided metrics.
+ pub fn new(metrics: std::collections::HashMap<String, usize>) -> Self {
+ Self { metrics }
+ }
+
+ /// Returns `true` if the report contains no metrics.
+ pub fn is_empty(&self) -> bool {
+ self.metrics.is_empty()
+ }
+
+ /// Number of tracked operators in the report.
+ pub fn len(&self) -> usize {
+ self.metrics.len()
+ }
+
+ /// Consume the report and return the underlying metrics.
+ pub fn into_inner(self) -> std::collections::HashMap<String, usize> {
+ self.metrics
+ }
+}
+
+impl std::ops::Deref for MemoryReport {
+ type Target = std::collections::HashMap<String, usize>;
+
+ fn deref(&self) -> &Self::Target {
+ &self.metrics
+ }
+}
+
+impl From<std::collections::HashMap<String, usize>> for MemoryReport {
+ fn from(metrics: std::collections::HashMap<String, usize>) -> Self {
+ Self::new(metrics)
+ }
+}
+// Implement IntoIterator for &MemoryReport to allow iterating over &report
+impl<'a> IntoIterator for &'a MemoryReport {
+ type Item = (&'a String, &'a usize);
+ type IntoIter = std::collections::hash_map::Iter<'a, String, usize>;
+
+ fn into_iter(self) -> Self::IntoIter {
+ self.metrics.iter()
+ }
+}
+/// Enhanced memory profiling report with categorization and analysis
+#[derive(Debug)]
+pub struct EnhancedMemoryReport {
Review Comment:
I wonder why you chose to put this in the session/execution context and not
in the existing memory pool
https://docs.rs/datafusion/latest/datafusion/execution/memory_pool/index.html
In particular, I think this code has a lot of similarity to
https://docs.rs/datafusion/latest/datafusion/execution/memory_pool/struct.TrackConsumersPool.html
Perhaps we can modify that pool or add another wrapper pool for DataFusion
CLI that saves the maximum consumers, etc
##########
datafusion/core/src/execution/context/mod.rs:
##########
@@ -90,6 +90,244 @@ use chrono::{DateTime, Utc};
use object_store::ObjectStore;
use parking_lot::RwLock;
use url::Url;
+/// Memory profiling report for a query.
+#[derive(Debug, Clone, Default, PartialEq, Eq)]
+pub struct MemoryReport {
+ metrics: std::collections::HashMap<String, usize>,
Review Comment:
can we please document what this hash map contains (is it memory consumer
names?)
##########
datafusion-cli/src/exec.rs:
##########
@@ -227,9 +227,19 @@ pub(super) async fn exec_and_print(
let statements = DFParser::parse_sql_with_dialect(&sql, dialect.as_ref())?;
for statement in statements {
+ let _mem_handle = if print_options.memory_profiling {
+ // RAII guard: dropping the handle disables profiling after
execution
Review Comment:
I don't understand why this is named with a leading underscore given it is
referenced below
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