redis/memtier_benchmark

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NoSQL Redis and Memcache traffic generation and benchmarking tool.

Is redis/memtier_benchmark beginner-friendly?

The maintainers of redis/memtier_benchmark usually reply to a pull request within 1 day. 3 beginner-friendly issues are open now.

Stars: 1.1k
Forks: 257
Open beginner issues: 3
Indexed issues: 70
Avg merge: 13h 56m
Merged PRs (30d): 50

Dominant language: C++
License: GPL-2.0
Last GitHub push: Oct 6, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

How to contribute to redis/memtier_benchmark

Read the contributing guide first: it says how the maintainers want changes proposed, tested and reviewed.
It ships a Dockerfile or Docker Compose file, so you can run it without installing its whole toolchain.
Your contributions will be published under the project's GPL-2.0 license.
Pick one of the 3 open beginner-friendly issues below and comment that you want to work on it before you start.

Beginner friendly Everything

Open All

Issues somebody may already be working on are listed last. List everything by date

Cluster --read-preference: every -READONLY without a retry target triggers a CLUSTER SLOTS refresh (one per reply)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 40/100

redis/memtier_benchmark#651 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
Cluster mode without --retry-on-error: a -MOVED/-ASK reply is counted as a completed op (Count > commands the server ran) - intended?
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

redis/memtier_benchmark#650 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
Cluster --transaction: 'pin connection received MOVED mid-rotation' warning is printed once per rotation during a slot migration (hundreds of lines)
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 45/100

redis/memtier_benchmark#649 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
Cluster: an empty or -ERR CLUSTER SLOTS reply leaves the connection stuck; mid-run the process hangs, ignoring --test-time
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 55/100

redis/memtier_benchmark#648 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
--transaction with --requests: run can end after a MULTI without its EXEC when --requests is not a multiple of the block length
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 50/100

redis/memtier_benchmark#647 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
JSON output has no errors / retry_attempts / retried_ops counters for --retry-on-error runs
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 68/100

redis/memtier_benchmark#646 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
test_json_output_integrity: latency tolerance lets a truncated average pass on low-count buckets and wrongly fails low-count sections
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 65/100

redis/memtier_benchmark#645 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
bash completion is installed to an absolute system path that ignores --prefix, so non-root prefix installs and make distcheck fail
Open
- Is something wrong?
Difficulty 3/5 Half a day Newbie friendliness 55/100

redis/memtier_benchmark#644 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
Vendored ax_code_coverage.m4 (serial 15) rejects lcov 2.x, fails code-coverage-capture on lcov 2.x, leaves .gcno on clean, and can't link with clang
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 42/100

redis/memtier_benchmark#643 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
Whole-run Hits/sec, Misses/sec, MOVED/sec and ASK/sec wrap after 2^32 events: 32-bit counters in one_sec_cmd_stats are summed across the run
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 72/100

redis/memtier_benchmark#642 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
tests: harness crashes under RLTest --env existing-env and -s (dbDirPath / missing redis log, CONFIG GET reply sliced as a list)
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 78/100

redis/memtier_benchmark#641 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
configure.ac: LT_INIT is unused, and without libtool installed configure prints "LT_INIT: command not found" but continues
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 50/100

redis/memtier_benchmark#640 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
--monitor-input: a second --command "__monitor_line@__" takes over the stats slots of the first, which always report 0 ops
Open
- Is something wrong?
Difficulty 3/5 Half a day Newbie friendliness 42/100

redis/memtier_benchmark#639 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
Text output prints -nan Avg. Latency for a --command row with zero ops
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 85/100

redis/memtier_benchmark#638 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
Prometheus memtier_latency_seconds stops growing after the first second (samples ~0.1% of ops, not ~50% as documented)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

redis/memtier_benchmark#637 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
TLS cluster: worker stalls after reconnects (unsent output, handshake never completes)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

redis/memtier_benchmark#562 · 1 comment · Opened Oct 12, 2026

Maintainers usually reply within 1 day
Verify whether bufferevent_write is actually required for READONLY/CLIENT NO-TOUCH on discovered connections, or the original diagnosis was wrong
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

redis/memtier_benchmark#532 · 1 comment · Opened Aug 28, 2026

Maintainers usually reply within 1 day
All CI test cells depend on a personal fork's availability (tests/test_requirements.txt -> fcostaoliveira/RLTest)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 62/100

redis/memtier_benchmark#530 · Opened Aug 28, 2026

Maintainers usually reply within 1 day
Investigate whether peer_client_has_any_setup_in_progress() gating on is_ready_for_reads() (not is_conn_setup_done()) can livelock read routing
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 45/100

redis/memtier_benchmark#529 · Opened Aug 28, 2026

Maintainers usually reply within 1 day
Consider a generic --connection-setup-command flag instead of per-command booleans
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

redis/memtier_benchmark#528 · 2 comments · Opened Aug 27, 2026

Maintainers usually reply within 1 day
Customers commonly exhaust AWS burst credits on Elasticache. Need to measure network, cpu and iops against ec2 instance limits.
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

redis/memtier_benchmark#514 · Opened Jul 16, 2026

Maintainers usually reply within 1 day
Only send HELLO when the server supports it (avoid breaking RESP2 against pre-6.0 servers)
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 45/100

redis/memtier_benchmark#488 · Opened Jun 24, 2026

Maintainers usually reply within 1 day
Pre-existing latent hang in zipfian arbitrary-command path (test_zipfian_arbitrary_command_mixed_operations) under UBSan
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 38/100

redis/memtier_benchmark#482 · Opened Jun 17, 2026

Maintainers usually reply within 1 day
run_stats: add unit-test scaffolding + revert PR #465 workarounds + add #463 regression marker
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 52/100

redis/memtier_benchmark#466 · Opened Jun 9, 2026

Maintainers usually reply within 1 day
test harness: read-preference CI cell silently skips all tests
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 55/100

redis/memtier_benchmark#462 · 2 comments · Opened Jun 7, 2026

Maintainers usually reply within 1 day
Dead `redis_protocol::write_command_readonly` passes wrong length (16 vs 18 bytes)
Open
- Is something wrong?
Difficulty 1/5 Under an hour Newbie friendliness 84/100

redis/memtier_benchmark#461 · Opened Jun 6, 2026

Maintainers usually reply within 1 day
`m_resp3` flips at HELLO write-time, should flip on HELLO ack
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 78/100

redis/memtier_benchmark#460 · Opened Jun 6, 2026

Maintainers usually reply within 1 day
RESP3 boolean type (`#t`/`#f`) not handled in IntegerMembership miss-tracking
Open
- Is something wrong?
Difficulty 1/5 Under an hour Newbie friendliness 88/100

redis/memtier_benchmark#459 · Opened Jun 6, 2026

Maintainers usually reply within 1 day
RESP3 attribute (`|`) prefix pollutes reply mbulk tree
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 68/100

redis/memtier_benchmark#458 · Opened Jun 6, 2026

Maintainers usually reply within 1 day
follow-up: monitor + keyless arbitrary read-pref improvements
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

redis/memtier_benchmark#457 · Opened Jun 5, 2026

Maintainers usually reply within 1 day
Support multi-endpoint benchmarks for Redis Active-Active write/read testing
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

redis/memtier_benchmark#452 · Opened Jun 3, 2026

Maintainers usually reply within 1 day
cluster_client: supervisor-abort path leaks partial cluster_client state (LSAN flag)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 50/100

redis/memtier_benchmark#450 · Opened Jun 3, 2026

Maintainers usually reply within 1 day
monitor-input: downstream c_str() re-truncates NUL bytes in arbitrary command dispatch
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

redis/memtier_benchmark#439 · Opened Jun 2, 2026

Maintainers usually reply within 1 day
CLI-fuzz follow-ups: 17 crash/hang classes (11 share connection-stage retry-loop root cause)
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 30/100

redis/memtier_benchmark#426 · Opened Jun 1, 2026

Maintainers usually reply within 1 day
Crash handler is not async-signal-safe (SA_ONSTACK set, sigaltstack never called) — truncates under corrupted-stack crashes
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

redis/memtier_benchmark#412 · Opened May 30, 2026

Maintainers usually reply within 1 day
Audit: latent stack-allocation foot-guns (incl. HIGH-severity unbounded sscanf in memcached parser)
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

redis/memtier_benchmark#406 · Opened May 30, 2026

Maintainers usually reply within 1 day
memtier_benchmark rate-limiting oscillations on Amazon Linux 2023
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

redis/memtier_benchmark#361 · Opened Apr 21, 2026

Maintainers usually reply within 1 day
Support plain command-file input for arbitrary command corpora
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

redis/memtier_benchmark#359 · Opened Mar 21, 2026

Maintainers usually reply within 1 day
When the speed limit parameter value is small, the startup error is reported
May be free again @fcostaoliveira claimed this 285 days ago, and no pull request is open. Open
- Is something wrong?
redis/memtier_benchmark#303 · 1 assignee · Opened Mar 31, 2025

Maintainers usually reply within 1 day
Optimize latency data: remove the time when the benchmark generates data
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

redis/memtier_benchmark#292 · Opened Jan 9, 2025

Maintainers usually reply within 1 day
When using memtier_benchmark version 2.1.2, a bug occurs where duplicate logs and incorrect data are occasionally printed.
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

redis/memtier_benchmark#284 · 5 comments · Opened Dec 28, 2024

Maintainers usually reply within 1 day
startup error ：void shard_connection::push_req(request*):Assertion 'm_request_per_cur_interval > 0 ' failed
May be free again @fcostaoliveira claimed this 313 days ago, and no pull request is open. Open
- Is something wrong?
bug

redis/memtier_benchmark#283 · 3 comments · 1 assignee · Opened Dec 28, 2024

Maintainers usually reply within 1 day
When execute EVAL command in cluster mode, 'All Stats' output contains zeros for all the columns except 'Latency'
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

redis/memtier_benchmark#263 · 1 comment · Opened Aug 25, 2024

Maintainers usually reply within 1 day
Running multiple commands with different types?
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

redis/memtier_benchmark#244 · 2 comments · Opened Dec 5, 2023

Maintainers usually reply within 1 day
arbitrary command with memcached
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

redis/memtier_benchmark#223 · 1 comment · Opened May 18, 2023

Maintainers usually reply within 1 day
Large key-median value causes error even though it is between key-minimum and key-maximum
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 45/100

redis/memtier_benchmark#211 · Opened Apr 14, 2023

Maintainers usually reply within 1 day
Bizarre benchmarking result while it generates TLS workloads to Redis
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 35/100

redis/memtier_benchmark#210 · Opened Mar 16, 2023

Maintainers usually reply within 1 day
MacOS requires brew path for libssl
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 52/100

redis/memtier_benchmark#199 · Opened Dec 28, 2022

Maintainers usually reply within 1 day
Handle `TRYAGAIN` in cluster mode
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 38/100

redis/memtier_benchmark#194 · Opened Oct 27, 2022

Maintainers usually reply within 1 day
about to twemproxy
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 20/100

redis/memtier_benchmark#164 · 2 comments · Opened Oct 13, 2021

Maintainers usually reply within 1 day

redis/memtier_benchmark

Is redis/memtier_benchmark beginner-friendly?

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