diff --git a/podman/README.md b/podman/README.md
index 60b61530..793bfe3c 100644
--- a/podman/README.md
+++ b/podman/README.md
@@ -10,19 +10,17 @@ instructions below illustrate how we build the container for use at
 All images are tagged and have been publicly checked into
 [dockerhub/desihub](https://hub.docker.com/orgs/desihub/repositories).
 
-## Logging into dockerhub (optional)
+## Log into dockerhub (optional)
 
-When building a container, first log into `dockerhub`:
+When building a container, first log into `dockerhub` (credentials required):
 ```
 podman-hpc login docker.io
-Username:
-Password:
 ```
 
 ## Build the base container
 
 We first build a "base" container to hold our installation of
-[mpich](https://www.mpich.org/) and
+[MPICH](https://www.mpich.org/) and
 [mpi4py](https://mpi4py.readthedocs.io/en/stable/). Using a base image allows us
 to make changes to the top-level container without having to rebuild the base
 image, which can take up to 20 minutes. (Note that a two-stage build does not
@@ -46,18 +44,57 @@ podman-hpc migrate desihub/fastspecfit:3.1.1
 podman-hpc push desihub/fastspecfit:3.1.1
 ```
 
+## Deploy the container
+
+To deploy the container in production please refer to the [FastSpecFit
+documentation](https://fastspecfit.readthedocs.io/en/latest/) for the latest
+details and instructions. However, briefly, one can test the container in an
+interactive node:
+```
+salloc -N 1 -C cpu -A desi -t 01:00:00 --qos interactive
+podman-hpc pull desihub/fastspecfit:3.1.1
+```
+
+First, make sure `mpi4py` works with the [Cray-optimized version of
+MPICH](https://docs.nersc.gov/development/containers/podman-hpc/overview/#using-cray-mpich-in-podman-hpc) by running
+```
+podman-hpc run --rm --mpi desihub/fastspecfit:3.1.1 python -m mpi4py --mpi-lib-version
+MPI VERSION    : CRAY MPICH version 8.1.22.12 (ANL base 3.4a2)
+MPI BUILD INFO : Wed Nov 09 12:31 2022 (git hash cfc6f82)
+```
+and
+```
+srun --ntasks=4 podman-hpc run --rm --mpi desihub/fastspecfit:3.1.1 python -m mpi4py.bench helloworld
+Hello, World! I am process 0 of 4 on nid200010.
+Hello, World! I am process 1 of 4 on nid200010.
+Hello, World! I am process 2 of 4 on nid200010.
+Hello, World! I am process 3 of 4 on nid200010.
+```
+
+Next, try running a couple healpixels:
+```
+srun --ntasks=8 podman-hpc run --rm --mpi --group-add keep-groups --volume=/dvs_ro/cfs/cdirs:/dvs_ro/cfs/cdirs \
+  --volume=/global/cfs/cdirs:/global/cfs/cdirs --volume=$PSCRATCH:/scratch desihub/fastspecfit:3.1.1 mpi-fastspecfit \
+  --specprod=loa --survey=sv3 --program=dark --healpix=26278,26279 --ntargets=16 --mp=4 --outdir-data=/scratch/fasttest
+```
+
 ## Handy commands
 
 * List the available images:
 ```
 podman-hpc images
+REPOSITORY                          TAG         IMAGE ID      CREATED         SIZE        R/O
+localhost/desihub/fastspecfit       3.1.1       31a5c5041d1d  50 minutes ago  1.67 GB     true
+localhost/desihub/fastspecfit-base  1.0         abd6485d4cb5  16 hours ago    719 MB      true
 ```
 
 * Check the installed versions of `mpich` and `mpi4py`:
 ```
 podman-hpc run --rm desihub/fastspecfit:3.1.1 python -m mpi4py --version
 mpi4py 4.0.1
-
+```
+and
+```
 podman-hpc run --rm desihub/fastspecfit:3.1.1 python -m mpi4py --mpi-lib-version
 MPICH Version:3.4.3
 MPICH Release date:Thu Dec 16 11:20:57 CST 2021
@@ -70,13 +107,16 @@ MPICH F77:gfortran -fallow-argument-mismatch  -O2
 MPICH FC:gfortran -fallow-argument-mismatch  -O2
 ```
 
-* To delete a container:
+* To make sure the `numba` cache is being used correctly, in the production
+example, above, simply set the `NUMBA_DEBUG_CACHE` environment variable
+on-the-fly:
 ```
-podman-hpc rmi desihub/fastspecfit:3.1.1
+srun --ntasks=8 podman-hpc run --rm --mpi --group-add keep-groups --volume=/dvs_ro/cfs/cdirs:/dvs_ro/cfs/cdirs \
+  --volume=/global/cfs/cdirs:/global/cfs/cdirs --volume=$PSCRATCH:/scratch --env NUMBA_DEBUG_CACHE=1 desihub/fastspecfit:3.1.1 mpi-fastspecfit \
+  --specprod=loa --survey=sv3 --program=dark --healpix=26278,26279 --ntargets=16 --mp=4 --outdir-data=/scratch/fasttest
 ```
 
+* To delete a container:
 ```
-srun --ntasks=4 podman-hpc run --rm --mpi desihub/fastspecfit-base:1.0 python -m mpi4py.bench helloworld
-podman-hpc run --userns keep-id --group-add keep-groups --rm --volume=/dvs_ro/cfs/cdirs:/dvs_ro/cfs/cdirs --volume=/pscratch/sd/i/ioannis:/scratch desihub/fastspecfit:3.1.1 /bin/bash
-podman-hpc run --userns keep-id --group-add keep-groups --rm --volume=/dvs_ro/cfs/cdirs:/dvs_ro/cfs/cdirs --volume=/global/cfs/cdirs:/global/cfs/cdirs --volume=/pscratch/sd/i/ioannis:/scratch --env NUMBA_CACHE_DIR=/scratch/numba_cache desihub/fastspecfit:3.1.1 /bin/bash
+podman-hpc rmi desihub/fastspecfit:3.1.1
 ```
diff --git a/py/fastspecfit/fastspecfit.py b/py/fastspecfit/fastspecfit.py
index ba9dad70..f3ba020a 100644
--- a/py/fastspecfit/fastspecfit.py
+++ b/py/fastspecfit/fastspecfit.py
@@ -319,9 +319,12 @@ def fastspec(fastphot=False, fitstack=False, args=None, comm=None, verbose=False
         # Each rank, including rank 0, iterates over each object and then sends
         # the results to rank 0.
         log.info(f'Rank {rank}: fitting {len(fitargs_onerank):,d} objects.')
+        t1 = time.time()
         out = []
         for fitarg_onerank in fitargs_onerank:
             out.append(fastspec_one(**fitarg_onerank))
+        log.info(f'Rank {rank}: done fitting {len(out):,d} objects in ' + \
+                 f'{(time.time()-t1:.2f) / 60.} minutes.')
 
         if rank > 0:
             #log.debug(f'Rank {rank} sending data on {len(out)} objects to rank 0.')