PERF-2565 Added a Micro-benchmark for getMore Commands

[mdashti]

This PR adds a micro-benchmark that applies scan and non-selective-filter over a big collection with:

• different number of docs in the collection
• different sizes of documents in the collection
• different batch-sizes

These operations are followed with several getMore commands to read the whole result. This benchmark mostly measures the impact of getMore commands, as the query processing part is very simple and most of the time is spent on requesting the whole big result-set via several getMore commands.

[mdashti]

I'd suggest also apply the following diff to etc/perf.yml:

diff --git a/etc/perf.yml b/etc/perf.yml
index b633fde51ce..6b6323d4da2 100644
--- a/etc/perf.yml
+++ b/etc/perf.yml
@@ -474,6 +474,18 @@ tasks:
              exclude_filter: single_threaded,
              threads: "1 2 4 8",
              read_cmd: 'true'}
+  - name: big_collection
+    depends_on: *_compile
+    commands:
+      - func: f_run_dsi_workload
+        vars:
+          test_control: microbenchmarks
+          test_control_params: |
+            {include_filter_1: query,
+             include_filter_2: getmore,
+             exclude_filter: none,
+             threads: "1 2 4 8",
+             read_cmd: 'true'}
   - name: views-query
     depends_on: *_compile
     commands:
@@ -735,6 +747,7 @@ microbenchmark-buildvariants:
     - name: compile
       distros:
       - rhel62-large
+    - name: big_collection
     - name: genny_scale_InsertRemove
     - name: genny_execution_UserAcquisition
     - name: aggregation_read_commands

If you agree, I can create a separate SERVER ticket for that change and create a separate PR for it.

[brad-devlugt]

Hey @mdashti thanks for the PR and new workload. I'm substituting in for David as a reviewer from the perf team. Could you please run a few patches with this change + the etc/perf.yml change to see what the overall noise level is like for the new test? Please reach out if you have any questions!

[mdashti]

@brad-devlugt Thanks for accepting to take a look at this PR.

Here are a few evergreen patches:

1. https://spruce.mongodb.com/version/615cb5f22fbabe26cd1ac66a
2. https://spruce.mongodb.com/version/615cb6790305b951efd5a5e6
3. https://spruce.mongodb.com/version/615cb6cb1e2d175df439fe3c
4. https://spruce.mongodb.com/version/615cb6f1e3c3316dc7eaf06f

[mdashti]

Thanks for the review @brad-devlugt. Applied your suggestions. Here's the evergreen build: https://spruce.mongodb.com/version/615f43e53e8e86320ca969c5

[brad-devlugt]

Thanks! LGTM