OTFMERGE(1)

💅 OTFMERGE — like, the group chat for your OTF streams 💅

okay bestie, sit down, we're doing otfmerge from the User Commands section of the manual, and honestly? it's giving glow-up energy ✨

---

🎀 NAME 🎀

otfmerge — change the number of streams for an OTF trace 💖

no cap, that's the whole job. it takes your existing OTF trace and re-splits its streams. iconic. periodt.

---

✨ DESCRIPTION ✨

okay so. otfmerge changes the number of streams for an existing OTF trace. that's it, that's the vibe check. you feed it your trace, it hands you back a trace with a different stream situation. lowkey magic, highkey useful 🪄

here's the syntax, and yes you must give it an input file name, it's not optional, it's the main character:

otfmerge [options] <input file name>

then there's the options section, which is where all the fun lil knobs live 👇

🔧 options 🔧

• -h, --help — shows this help message. your lil "wait what did I type" rescue button 🫶
• -V — shows the OTF version. sometimes you just gotta know who you're talking to 💁♀️
• -p — show progress. so you're not just staring at a silent terminal wondering if it died 😭
• -n <n> — sets the number of streams for the output. set this to 0 for using one stream per process. default is 1. choose your fighter ⚔️
• -f <n> — max. number of filehandles available per rank. yes, per rank. respect the limit, bestie 🙈
• -o <name> — namestub of the output file. default is out. so if you don't name it, it's just gonna be out, which is very "no thoughts head empty" of you but okay 🍓
• -rb <size> — set buffersize of the reader (for each rank). buffer queen behavior 👑
• -wb <size> — set buffersize of the writer (for each rank). the writer gets a buffer too, we don't play favorites 💜
• -z <zlevel> — write compressed output. zlevel reaches from 0 to 9, where 0 is no compression and 9 is the highest level. so 9 is the most compressed, 0 is the "raw and unfiltered" option, we love both 🌈
• --stats — cover statistics too. don't leave the stats behind, they have feelings 🥺
• --snaps — cover snapshots too. snapshots getting included?? obsessed 📸
• --long — write long OTF format. the long format. the extended cut. the director's version 🔥

⚠️ bestie warning: the options are copied exactly as the manual gives them, so don't get creative with the flags, okay? -rb and -wb are their own whole thing, they are not -r and -w, and I will not be gaslit into pretending otherwise 💅

---

and that's the whole page, fr fr 🦋

this little beauty is otfmerge version 1.12.5, dated February 2026 — she's fresh, she's thriving, she's doing her lil thing. mwah. bye bestie 💖✨