diff --git a/rust/Cargo.lock b/rust/Cargo.lock
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -246,10 +246,10 @@
  "flate2 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "micro-timer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "micro-timer 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_distr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -269,7 +269,7 @@
  "cpython 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hg-core 0.1.0",
  "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "simple_logger 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -312,7 +312,7 @@
 
 [[package]]
 name = "log"
-version = "0.4.8"
+version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -347,16 +347,16 @@
 
 [[package]]
 name = "micro-timer"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "micro-timer-macros 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "micro-timer-macros 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "micro-timer-macros"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -572,6 +572,9 @@
 dependencies = [
  "clap 2.33.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hg-core 0.1.0",
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "micro-timer 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "simple_logger 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -616,7 +619,7 @@
  "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "colored 1.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -796,13 +799,13 @@
 "checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 "checksum libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)" = "eb147597cdf94ed43ab7a9038716637d2d1bf2bc571da995d0028dec06bd3018"
 "checksum libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "2eb5e43362e38e2bca2fd5f5134c4d4564a23a5c28e9b95411652021a8675ebe"
-"checksum log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
+"checksum log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b"
 "checksum maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
 "checksum memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 "checksum memmap 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6585fd95e7bb50d6cc31e20d4cf9afb4e2ba16c5846fc76793f11218da9c475b"
 "checksum memoffset 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "75189eb85871ea5c2e2c15abbdd541185f63b408415e5051f5cac122d8c774b9"
-"checksum micro-timer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "25b31d6cb9112984323d05d7a353f272ae5d7a307074f9ab9b25c00121b8c947"
-"checksum micro-timer-macros 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5694085dd384bb9e824207facc040c248d9df653f55e28c3ad0686958b448504"
+"checksum micro-timer 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2620153e1d903d26b72b89f0e9c48d8c4756cba941c185461dddc234980c298c"
+"checksum micro-timer-macros 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e28a3473e6abd6e9aab36aaeef32ad22ae0bd34e79f376643594c2b152ec1c5d"
 "checksum miniz_oxide 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "be0f75932c1f6cfae3c04000e40114adf955636e19040f9c0a2c380702aa1c7f"
 "checksum num-integer 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "3f6ea62e9d81a77cd3ee9a2a5b9b609447857f3d358704331e4ef39eb247fcba"
 "checksum num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "c62be47e61d1842b9170f0fdeec8eba98e60e90e5446449a0545e5152acd7096"
diff --git a/rust/rhg/Cargo.toml b/rust/rhg/Cargo.toml
--- a/rust/rhg/Cargo.toml
+++ b/rust/rhg/Cargo.toml
@@ -7,4 +7,6 @@
 [dependencies]
 hg-core = { path = "../hg-core"}
 clap = "2.33.1"
-
+log = "0.4.11"
+micro-timer = "0.3.1"
+simple_logger = "1.6.0"
diff --git a/rust/rhg/src/commands/debugdata.rs b/rust/rhg/src/commands/debugdata.rs
--- a/rust/rhg/src/commands/debugdata.rs
+++ b/rust/rhg/src/commands/debugdata.rs
@@ -4,6 +4,7 @@
 use hg::operations::{
     DebugData, DebugDataError, DebugDataErrorKind, DebugDataKind,
 };
+use micro_timer::timed;
 
 pub const HELP_TEXT: &str = "
 Dump the contents of a data file revision
@@ -21,6 +22,7 @@
 }
 
 impl<'a> Command for DebugDataCommand<'a> {
+    #[timed]
     fn run(&self, ui: &Ui) -> Result<(), CommandError> {
         let mut operation = DebugData::new(self.rev, self.kind);
         let data =
diff --git a/rust/rhg/src/main.rs b/rust/rhg/src/main.rs
--- a/rust/rhg/src/main.rs
+++ b/rust/rhg/src/main.rs
@@ -1,3 +1,4 @@
+extern crate log;
 use clap::App;
 use clap::AppSettings;
 use clap::Arg;
@@ -15,6 +16,7 @@
 use error::CommandError;
 
 fn main() {
+    simple_logger::init_by_env();
     let app = App::new("rhg")
         .setting(AppSettings::AllowInvalidUtf8)
         .setting(AppSettings::SubcommandRequired)